{"id":14963,"date":"2026-07-10T06:00:47","date_gmt":"2026-07-09T21:00:47","guid":{"rendered":"https:\/\/genai-ai.co.jp\/ai-kanri\/?p=14963"},"modified":"2026-07-10T06:00:48","modified_gmt":"2026-07-09T21:00:48","slug":"cc-c-string-compare","status":"publish","type":"post","link":"https:\/\/genai-ai.co.jp\/ai-kanri\/blog\/cc-c-string-compare\/","title":{"rendered":"\u30102026\u5e747\u6708\u6700\u65b0\u3011C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u3092\u5b8c\u5168\u89e3\u8aac\uff01strcmp\u30fbstrncmp\u30fbstrcasecmp\u306e\u4f7f\u3044\u65b9\u3068\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u30fbClaude Code\u3067\u5373\u89e3\u6c7a"},"content":{"rendered":"\n<style>\n.g-flow-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;}\n.g-flow-item{background:linear-gradient(135deg,#1a1a1a,#2a1015);color:#fff;border-radius:8px;padding:16px 14px;min-width:130px;flex:1;text-align:center;}\n.g-flow-arrow{color:#dc2626;font-size:20px;font-weight:700;}\n.g-card-row{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 32px;}\n.g-card-row>div{flex:1;min-width:220px;}\n@media(max-width:600px){\n  .g-flow-row{flex-direction:column;}\n  .g-flow-arrow{transform:rotate(90deg);}\n  .g-card-row{flex-direction:column;}\n  .g-card-row>div{min-width:100%;}\n}\n<\/style>\n\n\n\n<div style=\"margin:0 0 32px;\">\n  <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/07\/thumb-cc-c-string-compare-1.jpg\" alt=\"\u30102026\u5e747\u6708\u6700\u65b0\u3011C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u3092\u5b8c\u5168\u89e3\u8aac\uff01strcmp\u30fbstrncmp\u30fbstrcasecmp\u306e\u4f7f\u3044\u65b9\u3068\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u30fbClaude Code\u3067\u5373\u89e3\u6c7a\" style=\"width:100%;height:auto;border-radius:12px;display:block;\">\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-radius:12px;padding:24px 28px;margin:0 0 32px;border-left:4px solid #dc2626;\">\n  <p style=\"font-size:15px;font-weight:700;color:#1a1a1a;margin:0 0 16px;\">\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9<\/p>\n  <ol style=\"margin:0;padding-left:20px;font-size:14px;line-height:2.2;list-style:none;\">\n    <li><a href=\"#sec-01\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">01<\/span>C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u3068\u6bd4\u8f03\u306e\u57fa\u790e<\/a><\/li>\n    <li><a href=\"#sec-02\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">02<\/span>strcmp\u306e\u4f7f\u3044\u65b9\uff1a\u623b\u308a\u5024\u3068\u6bd4\u8f03\u306e\u4ed5\u7d44\u307f<\/a><\/li>\n    <li><a href=\"#sec-03\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">03<\/span>strncmp\u306e\u4f7f\u3044\u65b9\uff1a\u6587\u5b57\u6570\u3092\u6307\u5b9a\u3057\u3066\u6bd4\u8f03<\/a><\/li>\n    <li><a href=\"#sec-04\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">04<\/span>\u305d\u306e\u4ed6\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u95a2\u6570\uff1astrcasecmp\u30fbmemcmp\u7b49<\/a><\/li>\n    <li><a href=\"#sec-05\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">05<\/span>\u3088\u304f\u3042\u308b\u30d0\u30b0\u30d1\u30bf\u30fc\u30f310\u9078\u3068\u4fee\u6b63\u65b9\u6cd5<\/a><\/li>\n    <li><a href=\"#sec-06\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">06<\/span>Claude Code\u3067C\u306e\u30d0\u30b0\u3092\u5373\u8a3a\u65ad\u30fb\u4fee\u6b63\u3059\u308b\u65b9\u6cd5<\/a><\/li>\n    <li><a href=\"#faq\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">FAQ<\/span>\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><\/li>\n  <\/ol>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u306f\u3001\u300c==\u6f14\u7b97\u5b50\u304c\u4f7f\u3048\u306a\u3044\u300d\u300c\u623b\u308a\u5024\u304c0\u30fb\u6b63\u30fb\u8ca0\u306e3\u7a2e\u985e\u300d\u300c\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u30ea\u30b9\u30af\u304c\u3042\u308b\u300d\u306a\u3069\u3001\u4ed6\u306e\u8a00\u8a9e\u3068\u7570\u306a\u308b\u7f60\u304c\u591a\u3044\u9818\u57df\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f<strong>C\u8a00\u8a9e\u306estrcmp\u30fbstrncmp\u30fbstrcasecmp\u7b49\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u95a2\u6570\u3092\u5b8c\u5168\u89e3\u8aac<\/strong>\u3057\u3001\u3088\u304f\u3042\u308b\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u3068\u4fee\u6b63\u65b9\u6cd5\u3092\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u4f8b\u4ed8\u304d\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f8c\u534a\u3067\u306f\u3001<strong>Claude Code\u3092\u4f7f\u3063\u3066C\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d0\u30b0\u3092\u81ea\u52d5\u8a3a\u65ad\u30fb\u4fee\u6b63\u3059\u308b\u65b9\u6cd5<\/strong>\u3082\u7d39\u4ecb\u3057\u307e\u3059\u3002\u300c\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\uff08Segfault\uff09\u306e\u539f\u56e0\u304c\u308f\u304b\u3089\u306a\u3044\u300d\u300c\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u304d\u3066\u3044\u308b\u5834\u6240\u3092\u7279\u5b9a\u3057\u305f\u3044\u300d\u3068\u3044\u3046\u65b9\u306f\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u306f\u3001\u73fe\u4ee3\u306e\u8a00\u8a9e\uff08Python\u30fbJava\u7b49\uff09\u306b\u6163\u308c\u305f\u30a8\u30f3\u30b8\u30cb\u30a2\u304c\u300c\u306a\u305c\u3053\u3093\u306a\u306b\u8907\u96d1\u306a\u306e\u304b\u300d\u3068\u611f\u3058\u308b\u9818\u57df\u306e\u4e00\u3064\u3067\u3059\u3002C\u3067\u306f\u6587\u5b57\u5217\u306f\u300cchar\u578b\u306e\u914d\u5217\u300d\u3068\u3057\u3066\u6271\u308f\u308c\u3001\u6587\u5b57\u5217\u306e\u7d42\u7aef\u3092\u793a\u3059\u30cc\u30eb\u6587\u5b57\uff08\\0\uff09\u306e\u7ba1\u7406\u307e\u3067\u81ea\u5206\u3067\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u6839\u672c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001string\u95a2\u6570\u306e\u6319\u52d5\u304c\u76f4\u611f\u7684\u306b\u308f\u304b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u3067strcmp\u3092\u6b63\u3057\u304f\u4f7f\u3048\u3066\u3044\u3066\u3082\u3001\u623b\u308a\u5024\u306e\u610f\u5473\uff080=\u4e00\u81f4\u30010\u4ee5\u5916=\u4e0d\u4e00\u81f4\uff09\u3092\u5fd8\u308c\u3066\u300cif (strcmp(a, b))\u300d\u3092true\u3068\u3057\u3066\u4f7f\u3046\u30d0\u30b0\u306f\u975e\u5e38\u306b\u591a\u3044\u3067\u3059\u3002C\u306e\u6587\u5b57\u5217\u51e6\u7406\u306f\u300c\u30bc\u30ed\u304c\u6210\u529f\u3092\u610f\u5473\u3059\u308b\u300dUnix\u7684\u306a\u6163\u7fd2\u304c\u3042\u308a\u3001\u4ed6\u306e\u8a00\u8a9e\u306e\u611f\u899a\u3068\u9006\u306b\u306a\u308a\u3084\u3059\u3044\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>==\u6f14\u7b97\u5b50\u304c\u6587\u5b57\u5217\u6bd4\u8f03\u306b\u4f7f\u3048\u306a\u3044<\/strong>\u7406\u7531\u3068\u30dd\u30a4\u30f3\u30bf\u306e\u57fa\u790e\u304c\u7406\u89e3\u3067\u304d\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>strcmp\u30fbstrncmp\u306e\u623b\u308a\u5024\u306e\u6b63\u78ba\u306a\u610f\u5473<\/strong>\u3068\u3088\u304f\u3042\u308b\u8aa4\u7528\u30d1\u30bf\u30fc\u30f3\u304c\u308f\u304b\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>strcasecmp\u30fbmemcmp\u30fbstrncasecmp<\/strong>\u7b49\u306e\u4f7f\u3044\u5206\u3051\u304c\u660e\u78ba\u306b\u306a\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u30fb\u30cc\u30eb\u6587\u5b57\u30fb\u30dd\u30a4\u30f3\u30bf<\/strong>\u306b\u95a2\u3059\u308b\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u3068\u4fee\u6b63\u304c\u5b66\u3079\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>Claude Code\u3092\u4f7f\u3063\u305fC\u306e\u30c7\u30d0\u30c3\u30b0\u81ea\u52d5\u5316<\/strong>\u306e\u5177\u4f53\u7684\u306a\u65b9\u6cd5\u304c\u308f\u304b\u308b<\/span><\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-c-string-compare&#038;blog_slug=cc-c-string-compare\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-c-string-compare&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-01\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">01<\/span>\n  <span class=\"section-label\" style=\"display:block;\">BASICS<\/span>\n  <span class=\"section-title\" style=\"display:block;\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u3068\u6bd4\u8f03\u306e\u57fa\u790e<\/span>\n  <span class=\"section-desc\">char\u914d\u5217\u30fb\u30dd\u30a4\u30f3\u30bf\u30fb\u30cc\u30eb\u6587\u5b57\u7d42\u7aef\u306e\u7406\u89e3\u304c\u5168\u3066\u306e\u51fa\u767a\u70b9<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u8a00\u8a9e\u3067\u306f\u300cString\u578b\u300d\u3068\u3044\u3046\u578b\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u6587\u5b57\u5217\u306f<strong>char\u578b\u306e\u914d\u5217<\/strong>\u3068\u3057\u3066\u6271\u308f\u308c\u3001\u6700\u5f8c\u306b\u5fc5\u305a\u30cc\u30eb\u6587\u5b57\uff08<code>'\\0'<\/code>\uff09\u304c\u7f6e\u304b\u308c\u307e\u3059\u3002\u3053\u306e\u30cc\u30eb\u6587\u5b57\u304c\u6587\u5b57\u5217\u306e\u7d42\u7aef\u3092\u793a\u3059\u30b7\u30b0\u30ca\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ C\u8a00\u8a9e\u3067\u306e\u6587\u5b57\u5217\u306e\u57fa\u672c\nchar str1[] = \"hello\";   \/\/ = {'h','e','l','l','o','\\0'}\nchar str2[] = \"hello\";\n\n\/\/ ==\u306f\u30dd\u30a4\u30f3\u30bf\u6bd4\u8f03\uff08\u30a2\u30c9\u30ec\u30b9\u3092\u6bd4\u8f03\uff09\u3059\u308b\u305f\u3081\u3001\u6587\u5b57\u5217\u6bd4\u8f03\u306b\u306f\u4f7f\u3048\u306a\u3044\nif (str1 == str2) {  \/\/ \u3053\u308c\u306f\u6587\u5b57\u5217\u304c\u540c\u3058\u304b\u3069\u3046\u304b\u306e\u6bd4\u8f03\u3067\u306f\u306a\u3044\uff01\n    \/\/ \u591a\u304f\u306e\u5834\u5408false\u306b\u306a\u308b\uff08str1\u3068str2\u306f\u5225\u306e\u914d\u5217\u306e\u305f\u3081\uff09\n}\n\n\/\/ \u6b63\u3057\u3044\u6587\u5b57\u5217\u6bd4\u8f03\u306fstrcmp\u3092\u4f7f\u3046\n#include &lt;string.h&gt;\nif (strcmp(str1, str2) == 0) {\n    printf(\"\u6587\u5b57\u5217\u306f\u540c\u3058\u3067\u3059\\n\");\n}<\/code><\/pre>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>\u30cc\u30eb\u6587\u5b57\uff08Null Character \/ \\0\uff09<\/strong>\uff1aC\u8a00\u8a9e\u3067\u6587\u5b57\u5217\u306e\u7d42\u308f\u308a\u3092\u793a\u3059\u7279\u6b8a\u306a\u6587\u5b57\u3002ASCII\u5024\u306f0\uff08\u30bc\u30ed\uff09\u3067\u3001\u30b3\u30fc\u30c9\u3067\u306f'\\0'\u3068\u66f8\u304f\u3002C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u51e6\u7406\u95a2\u6570\uff08strlen\u30fbstrcmp\u30fbstrcat\u7b49\uff09\u306f\u3059\u3079\u3066\u3053\u306e\u30cc\u30eb\u6587\u5b57\u3067\u6587\u5b57\u5217\u306e\u7d42\u308f\u308a\u3092\u5224\u65ad\u3059\u308b\u3002\u30cc\u30eb\u6587\u5b57\u304c\u306a\u3044\u6587\u5b57\u5217\u3092\u51e6\u7406\u3059\u308b\u3068\u3001\u95a2\u6570\u304c\u3069\u3053\u307e\u3067\u3082\u8aad\u307f\u7d9a\u3051\u3066\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3084\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\u306e\u539f\u56e0\u306b\u306a\u308b\u3002<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">C\u8a00\u8a9e\u3067\u6587\u5b57\u5217\u6bd4\u8f03\u306b<code>==<\/code>\u304c\u4f7f\u3048\u306a\u3044\u7406\u7531\u306f\u3001<code>==<\/code>\u6f14\u7b97\u5b50\u304c\u300c\u6587\u5b57\u5217\u306e\u5185\u5bb9\u300d\u3067\u306f\u306a\u304f\u300c\u30dd\u30a4\u30f3\u30bf\u306e\u30a2\u30c9\u30ec\u30b9\uff08\u914d\u5217\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30e1\u30e2\u30ea\u4e0a\u306e\u5834\u6240\uff09\u300d\u3092\u6bd4\u8f03\u3059\u308b\u304b\u3089\u3067\u3059\u3002\u7570\u306a\u308b\u5909\u6570\u306b\u540c\u3058\u6587\u5b57\u5217\u300chello\u300d\u3092\u4ee3\u5165\u3057\u305f\u5834\u5408\u3001\u5185\u5bb9\u306f\u540c\u3058\u3067\u3082\u5225\u306e\u30e1\u30e2\u30ea\u9818\u57df\u306b\u5b58\u5728\u3059\u308b\u305f\u3081\u3001<code>==<\/code>\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>\u30dd\u30a4\u30f3\u30bf\uff08Pointer\uff09<\/strong>\uff1a\u30e1\u30e2\u30ea\u4e0a\u306e\u30a2\u30c9\u30ec\u30b9\uff08\u756a\u5730\uff09\u3092\u5024\u3068\u3057\u3066\u6301\u3064\u5909\u6570\u3002C\u8a00\u8a9e\u3067\u306f\u914d\u5217\u5909\u6570\u306f\u300c\u914d\u5217\u306e\u5148\u982d\u8981\u7d20\u306e\u30a2\u30c9\u30ec\u30b9\u300d\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3002\u300cchar *str = \"hello\"\u300d\u3068\u66f8\u304f\u3068\u3001str\u306f\u6587\u5b57\u5217\"hello\"\u304c\u683c\u7d0d\u3055\u308c\u305f\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3059\u3002==\u6f14\u7b97\u5b50\u3067\u30dd\u30a4\u30f3\u30bf\u540c\u58eb\u3092\u6bd4\u8f03\u3059\u308b\u3068\u3001\u300c\u540c\u3058\u30e1\u30e2\u30ea\u4e0a\u306e\u540c\u3058\u5834\u6240\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u300d\u304c\u6bd4\u8f03\u3055\u308c\u308b\uff08\u5185\u5bb9\u306e\u6bd4\u8f03\u3067\u306f\u306a\u3044\uff09\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u306f\u300c\u30e1\u30e2\u30ea\u4e0a\u306b\u4e26\u3093\u3060\u6587\u5b57\u306e\u5217\u3001\u6700\u5f8c\u306b\u30cc\u30eb\u6587\u5b57\u300d\u3068\u3044\u3046\u69cb\u9020\u3067\u3059\u3002\u5909\u6570\u540d\u306f\u305d\u306e\u5148\u982d\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3059\u30dd\u30a4\u30f3\u30bf\u306b\u904e\u304e\u307e\u305b\u3093\u3002==\u6f14\u7b97\u5b50\u306f\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u3001\u5185\u5bb9\u304c\u540c\u3058\u3067\u3082\u7570\u306a\u308b\u5834\u6240\u306b\u3042\u308b\u6587\u5b57\u5217\u540c\u58eb\u306f\u300c\u7b49\u3057\u304f\u306a\u3044\u300d\u3068\u5224\u5b9a\u3055\u308c\u307e\u3059\u3002C\u8a00\u8a9e\u3092\u5b66\u3076\u4e0a\u3067\u3001\u3053\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u914d\u5217\u306e\u95a2\u4fc2\u306f\u6700\u3082\u91cd\u8981\u306a\u6982\u5ff5\u306e\u4e00\u3064\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">char\u914d\u5217\u306b<br>\u6587\u5b57\u5217\u3092\u683c\u7d0d<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\\0\uff08\u30cc\u30eb\u6587\u5b57\uff09<br>\u304c\u672b\u5c3e\u306b\u81ea\u52d5\u4ed8\u52a0<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">strcmp()\u3067<br>\u5185\u5bb9\u3092\u6bd4\u8f03<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u623b\u308a\u5024\u304c0\u306a\u3089<br>\u4e00\u81f4\u3068\u5224\u5b9a<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-c-string-compare&#038;blog_slug=cc-c-string-compare\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-c-string-compare&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-02\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">02<\/span>\n  <span class=\"section-label\" style=\"display:block;\">STRCMP<\/span>\n  <span class=\"section-title\" style=\"display:block;\">strcmp\u306e\u4f7f\u3044\u65b9\uff1a\u623b\u308a\u5024\u3068\u6bd4\u8f03\u306e\u4ed5\u7d44\u307f<\/span>\n  <span class=\"section-desc\">0\u30fb\u6b63\u30fb\u8ca0\u306e\u623b\u308a\u5024\u306e\u610f\u5473\u3092\u6b63\u78ba\u306b\u7406\u89e3\u3059\u308b<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>strcmp()<\/code>\u306f<code>string.h<\/code>\u30d8\u30c3\u30c0\u3067\u63d0\u4f9b\u3055\u308c\u308bC\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u95a2\u6570\u3067\u30012\u3064\u306e\u6587\u5b57\u5217\u3092\u8f9e\u66f8\u9806\uff08\u6587\u5b57\u30b3\u30fc\u30c9\u9806\uff09\u3067\u6bd4\u8f03\u3057\u307e\u3059\u3002\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f<code>int strcmp(const char *s1, const char *s2);<\/code>\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>strcmp()\u306e\u623b\u308a\u5024<\/strong>\uff1astrcmp(s1, s2)\u304c\u8fd4\u3059\u6574\u6570\u5024\u306e\u610f\u5473\uff1a\u24600 = s1\u3068s2\u306e\u6587\u5b57\u5217\u304c\u5b8c\u5168\u306b\u4e00\u81f4\u3057\u3066\u3044\u308b \u2461\u8ca0\u306e\u5024 = s1\u304cs2\u3088\u308a\u8f9e\u66f8\u9806\u3067\u524d\uff08s1\u306e\u6587\u5b57\u30b3\u30fc\u30c9\u304cs2\u3088\u308a\u5c0f\u3055\u3044\uff09 \u2462\u6b63\u306e\u5024 = s1\u304cs2\u3088\u308a\u8f9e\u66f8\u9806\u3067\u5f8c\uff08s1\u306e\u6587\u5b57\u30b3\u30fc\u30c9\u304cs2\u3088\u308a\u5927\u304d\u3044\uff09\u3002\u91cd\u8981\uff1a\u5177\u4f53\u7684\u306a\u6b63\u8ca0\u306e\u5024\u306f\u51e6\u7406\u7cfb\u4f9d\u5b58\u3067\u3001-1\u30841\u3068\u306f\u9650\u3089\u306a\u3044\u3002\u300c== 0\u300d\u300c< 0\u300d\u300c> 0\u300d\u3068\u3044\u3046\u5f62\u3067\u5224\u5b9a\u3059\u308b\u306e\u304c\u6b63\u78ba\u3002<\/p>\n<\/div>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">#include &lt;stdio.h&gt;\n#include &lt;string.h&gt;\n\nint main() {\n    char s1[] = \"apple\";\n    char s2[] = \"apple\";\n    char s3[] = \"banana\";\n    char s4[] = \"APPLE\";  \/\/ \u5927\u6587\u5b57\n\n    \/\/ \u5b8c\u5168\u4e00\u81f4\n    printf(\"%d\\n\", strcmp(s1, s2));  \/\/ 0\uff08\u4e00\u81f4\uff09\n\n    \/\/ s1\u304c\u8f9e\u66f8\u9806\u3067\u524d\n    printf(\"%d\\n\", strcmp(s1, s3));  \/\/ \u8ca0\u306e\u5024\uff08apple\u306fbanana\u3088\u308a\u524d\uff09\n\n    \/\/ s3\u304c\u8f9e\u66f8\u9806\u3067\u524d\n    printf(\"%d\\n\", strcmp(s3, s1));  \/\/ \u6b63\u306e\u5024\uff08banana\u306fapple\u3088\u308a\u5f8c\uff09\n\n    \/\/ \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3059\u308b\n    printf(\"%d\\n\", strcmp(s1, s4));  \/\/ \u6b63\u306e\u5024\uff08\u5c0f\u6587\u5b57a\u306f\u5927\u6587\u5b57A\u3088\u308a\u6587\u5b57\u30b3\u30fc\u30c9\u304c\u5927\u304d\u3044\uff09\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">strcmp\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ \u30d1\u30bf\u30fc\u30f31\uff1a\u4e00\u81f4\u78ba\u8a8d\uff08\u6700\u3082\u4e00\u822c\u7684\uff09\nif (strcmp(str1, str2) == 0) {\n    printf(\"\u4e00\u81f4\\n\");\n}\n\n\/\/ \u30d1\u30bf\u30fc\u30f32\uff1a\u8f9e\u66f8\u9806\u306e\u524d\u5f8c\u78ba\u8a8d\nif (strcmp(str1, str2) &lt; 0) {\n    printf(\"str1\u304cstr2\u3088\u308a\u8f9e\u66f8\u9806\u3067\u524d\\n\");\n} else if (strcmp(str1, str2) &gt; 0) {\n    printf(\"str1\u304cstr2\u3088\u308a\u8f9e\u66f8\u9806\u3067\u5f8c\\n\");\n} else {\n    printf(\"\u540c\u3058\\n\");\n}\n\n\/\/ \u30d1\u30bf\u30fc\u30f33\uff1a\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u5f15\u6570\u306e\u5224\u5b9a\nint main(int argc, char *argv[]) {\n    if (argc &gt; 1 &amp;&amp; strcmp(argv[1], \"--help\") == 0) {\n        printf(\"\u30d8\u30eb\u30d7\u3092\u8868\u793a\u3057\u307e\u3059\\n\");\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\">\n  <div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\">\n    <span style=\"font-size:20px;\">&#9888;&#65039;<\/span>\n    <strong style=\"color:#dc2626;font-size:16px;\">\u6700\u3082\u3088\u304f\u3042\u308b\u8aa4\u308a\uff1a\u300cif (strcmp(a, b))\u300d\u304ctrue\u3092\u610f\u5473\u3059\u308b\u3068\u601d\u3044\u8fbc\u3080<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">C\u8a00\u8a9e\u521d\u5fc3\u8005\u304c\u983b\u7e41\u306b\u72af\u3059\u8aa4\u308a\u304c\u300cstrcmp()\u304c0\u4ee5\u5916\uff08true\u3068\u8a55\u4fa1\u3055\u308c\u308b\u5024\uff09\u3092\u8fd4\u3057\u305f\u3089\u4e00\u81f4\u300d\u3068\u3044\u3046\u52d8\u9055\u3044\u3067\u3059\u3002\u5b9f\u969b\u306f\u9006\u3067\u3001\u300c0 = \u4e00\u81f4\u30010\u4ee5\u5916 = \u4e0d\u4e00\u81f4\u300d\u3067\u3059\u3002\u300cif (strcmp(a, b))\u300d\u306fstrcmp\u304c0\u4ee5\u5916\u3092\u8fd4\u3057\u305f\u3068\u304d\uff08\u3064\u307e\u308a\u6587\u5b57\u5217\u304c\u4e0d\u4e00\u81f4\u306e\u3068\u304d\uff09\u306btrue\u306b\u306a\u308a\u307e\u3059\u3002\u4e00\u81f4\u3092\u78ba\u8a8d\u3057\u305f\u3044\u306a\u3089\u300cif (strcmp(a, b) == 0)\u300d\u3068\u660e\u793a\u7684\u306b\u66f8\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">strcmp\u306e\u623b\u308a\u5024\u304c\u30bc\u30ed\u3067\u4e00\u81f4\u3068\u3044\u3046\u306e\u306f\u3001UNIX\u306e\u6163\u4f8b\u300c\u6210\u529f\u3057\u305f\u30890\u3092\u8fd4\u3059\u300d\u306b\u7531\u6765\u3057\u307e\u3059\u3002C\u8a00\u8a9e\u3092\u5b66\u3076\u3068\u304d\u300cif (strcmp(a, b)) \u306f\u300c\u4e00\u81f4\u3057\u305f\u3089\u5b9f\u884c\u300d\u3067\u306f\u306a\u304f\u300c\u4e0d\u4e00\u81f4\u306a\u3089\u5b9f\u884c\u300d\u3068\u3044\u3046\u70b9\u304c\u6700\u521d\u306e\u95a2\u9580\u306b\u306a\u308a\u307e\u3059\u3002\u300c== 0\u300d\u3092\u660e\u793a\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u660e\u78ba\u306b\u306a\u308a\u8aa4\u89e3\u3082\u9632\u3052\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-c-string-compare&#038;blog_slug=cc-c-string-compare\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-c-string-compare&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-03\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">03<\/span>\n  <span class=\"section-label\" style=\"display:block;\">STRNCMP<\/span>\n  <span class=\"section-title\" style=\"display:block;\">strncmp\u306e\u4f7f\u3044\u65b9\uff1a\u6587\u5b57\u6570\u3092\u6307\u5b9a\u3057\u3066\u6bd4\u8f03<\/span>\n  <span class=\"section-desc\">\u5148\u982dN\u6587\u5b57\u3060\u3051\u3092\u6bd4\u8f03\u3057\u3066\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u9632\u3050<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>strncmp()<\/code>\u306f<code>strcmp()<\/code>\u306e\u5b89\u5168\u7248\u3067\u3059\u3002\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f<code>int strncmp(const char *s1, const char *s2, size_t n);<\/code>\u3067\u3001\u7b2c3\u5f15\u6570<code>n<\/code>\u3067\u6bd4\u8f03\u3059\u308b\u6700\u5927\u6587\u5b57\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">#include &lt;stdio.h&gt;\n#include &lt;string.h&gt;\n\nint main() {\n    char s1[] = \"apple_pie\";\n    char s2[] = \"apple_cake\";\n\n    \/\/ \u5148\u982d5\u6587\u5b57\u3060\u3051\u3092\u6bd4\u8f03\uff08\"apple\"\u306e\u90e8\u5206\uff09\n    int result = strncmp(s1, s2, 5);\n    printf(\"%d\\n\", result);  \/\/ 0\uff08\u5148\u982d5\u6587\u5b57\u306f\u540c\u3058\uff09\n\n    \/\/ \u5168\u4f53\u3092\u6bd4\u8f03\n    result = strncmp(s1, s2, 10);\n    printf(\"%d\\n\", result);  \/\/ 0\u4ee5\u5916\uff08_pie\u3068_cake\u3067\u9055\u3046\uff09\n\n    \/\/ 1\u6587\u5b57\u3060\u3051\u6bd4\u8f03\n    result = strncmp(s1, s2, 1);\n    printf(\"%d\\n\", result);  \/\/ 0\uff08\u5148\u982d\u306e'a'\u306f\u540c\u3058\uff09\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">strncmp\u3092\u4f7f\u3046\u3079\u304d\u5834\u9762<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">strncmp\u304c\u7279\u306b\u6709\u52b9\u306a\u306e\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u3059\uff1a\u2460\u30d7\u30ed\u30c8\u30b3\u30eb\u30fb\u30b3\u30de\u30f3\u30c9\u306e\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u78ba\u8a8d\uff08\u300cGET\u3067\u59cb\u307e\u308bHTTP\u30ea\u30af\u30a8\u30b9\u30c8\u304b\u300d\u306a\u3069\uff09\u2461\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u9632\u304e\u305f\u3044\u5834\u5408\u2462\u56fa\u5b9a\u9577\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ HTTP\u30e1\u30bd\u30c3\u30c9\u306e\u5224\u5b9a\nchar request[] = \"GET \/index.html HTTP\/1.1\";\nif (strncmp(request, \"GET\", 3) == 0) {\n    printf(\"GET\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u3059\\n\");\n} else if (strncmp(request, \"POST\", 4) == 0) {\n    printf(\"POST\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u3059\\n\");\n}\n\n\/\/ \u30b3\u30de\u30f3\u30c9\u306e\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u78ba\u8a8d\nchar cmd[] = \"quit_now\";\nif (strncmp(cmd, \"quit\", 4) == 0) {\n    printf(\"\u7d42\u4e86\u30b3\u30de\u30f3\u30c9\u304c\u5165\u529b\u3055\u308c\u307e\u3057\u305f\\n\");\n}<\/code><\/pre>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\uff08Buffer Overflow\uff09<\/strong>\uff1a\u914d\u5217\uff08\u30d0\u30c3\u30d5\u30a1\uff09\u306e\u5883\u754c\u3092\u8d85\u3048\u3066\u30e1\u30e2\u30ea\u306b\u66f8\u304d\u8fbc\u3080\u30fb\u8aad\u307f\u8fbc\u3080\u8106\u5f31\u6027\u3002C\u8a00\u8a9e\u3067\u306f\u6587\u5b57\u5217\u306e\u9577\u3055\u30c1\u30a7\u30c3\u30af\u3092\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u660e\u793a\u7684\u306b\u884c\u308f\u306a\u3044\u3068\u767a\u751f\u3057\u3084\u3059\u3044\u3002\u4f8b\u3048\u3070strcpy(dest, src)\u3067src\u304cdest\u3088\u308a\u9577\u3044\u5834\u5408\u3001dest\u306e\u30d0\u30c3\u30d5\u30a1\u3092\u8d85\u3048\u305f\u90e8\u5206\u306e\u30e1\u30e2\u30ea\u304c\u4e0a\u66f8\u304d\u3055\u308c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30af\u30e9\u30c3\u30b7\u30e5\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4fb5\u5bb3\uff08\u4efb\u610f\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\uff09\u306b\u3064\u306a\u304c\u308b\u3002strncpy\u3084strncat\u7b49\u306en\u7cfb\u95a2\u6570\u3067\u30b5\u30a4\u30ba\u5236\u9650\u3092\u304b\u3051\u308b\u3053\u3068\u304c\u57fa\u672c\u7684\u306a\u5bfe\u7b56\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\">\n  <div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\">\n    <span style=\"font-size:18px;\">&#128161;<\/span>\n    <strong style=\"color:#16a34a;font-size:15px;\">strncmp\u306e\u7b2c3\u5f15\u6570\u306b\u306f\u5c0f\u3055\u3044\u65b9\u306e\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u4f7f\u3046<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">strncmp\u306e\u5b89\u5168\u306a\u4f7f\u3044\u65b9\u3068\u3057\u3066\u300c\u6bd4\u8f03\u3059\u308b2\u3064\u306e\u6587\u5b57\u5217\u306e\u3046\u3061\u3001\u30d0\u30c3\u30d5\u30a1\u304c\u5c0f\u3055\u3044\u65b9\u306e\u30b5\u30a4\u30ba\u300d\u3092\u7b2c3\u5f15\u6570\u306b\u4f7f\u3046\u30d1\u30bf\u30fc\u30f3\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002sizeof()\u3084strlen()\u3067\u7b97\u51fa\u3057\u305f\u5024\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u610f\u56f3\u305b\u305a\u914d\u5217\u7bc4\u56f2\u5916\u3092\u30a2\u30af\u30bb\u30b9\u3059\u308b\u30ea\u30b9\u30af\u3092\u4e0b\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">strncmp\u306f\u300c\u5b89\u5168\u306astrcmp\u300d\u3068\u3057\u3066\u899a\u3048\u3066\u304a\u304f\u3068\u3088\u3044\u3067\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u3084\u5916\u90e8\u30c7\u30fc\u30bf\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306f\u5e38\u306bstrncmp\u3092\u4f7f\u3044\u3001\u6700\u5927\u6bd4\u8f03\u6587\u5b57\u6570\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3092\u30eb\u30fc\u30eb\u306b\u3059\u308b\u3068\u3001\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u95a2\u9023\u306e\u30d0\u30b0\u3092\u69cb\u9020\u7684\u306b\u9632\u3052\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-c-string-compare&#038;blog_slug=cc-c-string-compare\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-c-string-compare&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-04\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">04<\/span>\n  <span class=\"section-label\" style=\"display:block;\">FUNCTIONS<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u305d\u306e\u4ed6\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u95a2\u6570\uff1astrcasecmp\u30fbmemcmp\u7b49<\/span>\n  <span class=\"section-desc\">POSIX\u95a2\u6570\u30fb\u30e1\u30e2\u30ea\u6bd4\u8f03\u30fb\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u7121\u8996\u306e\u4f7f\u3044\u5206\u3051<\/span>\n<\/h2>\n\n\n\n<table>\n<thead><tr><th>\u95a2\u6570\u540d<\/th><th>\u30d8\u30c3\u30c0<\/th><th>\u7528\u9014<\/th><th>\u6ce8\u610f\u70b9<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>strcmp(s1, s2)<\/td><td>string.h<\/td><td>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u533a\u5225\u306e\u5b8c\u5168\u6bd4\u8f03<\/td><td>n\u7cfb\u306e\u4f7f\u7528\u3092\u63a8\u5968<\/td><\/tr>\n<tr><td>strncmp(s1, s2, n)<\/td><td>string.h<\/td><td>n\u6587\u5b57\u307e\u3067\u306e\u6bd4\u8f03<\/td><td>C\u6a19\u6e96\u30fb\u5b89\u5168<\/td><\/tr>\n<tr><td>strcasecmp(s1, s2)<\/td><td>strings.h<\/td><td>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u7121\u8996\u306e\u6bd4\u8f03<\/td><td>POSIX\uff08Windows\u975e\u5bfe\u5fdc\uff09<\/td><\/tr>\n<tr><td>strncasecmp(s1, s2, n)<\/td><td>strings.h<\/td><td>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u7121\u8996\u30fbn\u6587\u5b57\u307e\u3067<\/td><td>POSIX\uff08Windows\u975e\u5bfe\u5fdc\uff09<\/td><\/tr>\n<tr><td>_stricmp(s1, s2)<\/td><td>string.h<\/td><td>Windows\u7248strcasecmp<\/td><td>MSVC\u5c02\u7528\uff08\u975e\u79fb\u690d\uff09<\/td><\/tr>\n<tr><td>memcmp(p1, p2, n)<\/td><td>string.h<\/td><td>\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u306en byte\u6bd4\u8f03<\/td><td>\u30cc\u30eb\u6587\u5b57\u3067\u6b62\u307e\u3089\u306a\u3044<\/td><\/tr>\n<tr><td>wcscmp(s1, s2)<\/td><td>wchar.h<\/td><td>\u30ef\u30a4\u30c9\u6587\u5b57\uff08Unicode\uff09\u306e\u6bd4\u8f03<\/td><td>\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u306b\u4f7f\u7528<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h3 class=\"wp-block-heading\">strcasecmp()\uff1a\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3057\u3066\u6bd4\u8f03<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>strcasecmp()<\/code>\u306fPOSIX\u898f\u683c\u306e\u95a2\u6570\u3067\u3001\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u305b\u305a\u306b\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002Linux\u3068mac\u3067\u4f7f\u3048\u307e\u3059\u304c\u3001Windows\u3067\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u4f7f\u3048\u306a\u3044\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">#include &lt;strings.h&gt;  \/\/ POSIX\uff08Linux\/Mac\uff09\n\nchar input[] = \"YES\";\nchar expected[] = \"yes\";\n\nif (strcasecmp(input, expected) == 0) {\n    printf(\"\u4e00\u81f4\uff08\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u7121\u8996\uff09\\n\");  \/\/ \u51fa\u529b\u3055\u308c\u308b\n}\n\n\/\/ Windows (MSVC) \u3067\u306f _stricmp \u3092\u4f7f\u3046\n#ifdef _WIN32\n    #define strcasecmp _stricmp\n#endif<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">memcmp()\uff1a\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u306e\u6bd4\u8f03<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>memcmp()<\/code>\u306f\u6587\u5b57\u5217\u3067\u306f\u306a\u304f\u4efb\u610f\u306e\u30e1\u30e2\u30ea\u9818\u57df\u3092\u30d0\u30a4\u30c8\u5358\u4f4d\u3067\u6bd4\u8f03\u3057\u307e\u3059\u3002\u30cc\u30eb\u6587\u5b57\uff08<code>\\0<\/code>\uff09\u3067\u505c\u6b62\u305b\u305a\u3001\u6307\u5b9a\u3057\u305f\u30d0\u30a4\u30c8\u6570\u3060\u3051\u6bd4\u8f03\u3059\u308b\u70b9\u304cstrcmp\u3068\u5927\u304d\u304f\u7570\u306a\u308a\u307e\u3059\u3002\u753b\u50cf\u30fb\u97f3\u58f0\u30fb\u30d0\u30a4\u30ca\u30ea\u30d7\u30ed\u30c8\u30b3\u30eb\u306a\u3069\u3001\u30c6\u30ad\u30b9\u30c8\u4ee5\u5916\u306e\u30c7\u30fc\u30bf\u6bd4\u8f03\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">#include &lt;stdio.h&gt;\n#include &lt;string.h&gt;\n\nint main() {\n    \/\/ \u901a\u5e38\u306e\u30c6\u30ad\u30b9\u30c8\u6bd4\u8f03\n    char s1[] = \"hello\\0world\";  \/\/ \u30cc\u30eb\u6587\u5b57\u3092\u542b\u3080\n    char s2[] = \"hello\\0earth\";\n\n    \/\/ strcmp\u306f\u30cc\u30eb\u6587\u5b57\u3067\u6b62\u307e\u308b\u306e\u3067\"hello\"\u307e\u3067\u3057\u304b\u6bd4\u8f03\u3057\u306a\u3044\n    printf(\"strcmp: %d\\n\", strcmp(s1, s2));   \/\/ 0\uff08hello\u307e\u3067\u4e00\u81f4\uff09\n\n    \/\/ memcmp\u306f12\u30d0\u30a4\u30c8\u5168\u90e8\u3092\u6bd4\u8f03\u3059\u308b\n    printf(\"memcmp: %d\\n\", memcmp(s1, s2, 12));  \/\/ 0\u4ee5\u5916\uff08world\u3068earth\u3067\u9055\u3046\uff09\n\n    \/\/ \u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u306e\u6bd4\u8f03\n    unsigned char hash1[] = {0x1a, 0x2b, 0x3c, 0x4d};\n    unsigned char hash2[] = {0x1a, 0x2b, 0x3c, 0x4d};\n    if (memcmp(hash1, hash2, 4) == 0) {\n        printf(\"\u30cf\u30c3\u30b7\u30e5\u5024\u304c\u4e00\u81f4\\n\");\n    }\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">memcmp\u306f\u30d0\u30a4\u30ca\u30ea\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u5b9f\u88c5\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7528\u9014\uff08\u30cf\u30c3\u30b7\u30e5\u5024\u306e\u6bd4\u8f03\u30fb\u6697\u53f7\u5316\u30c7\u30fc\u30bf\u306e\u691c\u8a3c\u7b49\uff09\u3067\u3088\u304f\u4f7f\u3044\u307e\u3059\u3002\u300c\u6587\u5b57\u5217\u306b\u306f\u4f7f\u308f\u306a\u3044\u3001\u30d0\u30a4\u30ca\u30ea\u306b\u306f\u4f7f\u3046\u300d\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u4f7f\u3044\u5206\u3051\u30eb\u30fc\u30eb\u304c\u6709\u52b9\u3067\u3059\u3002\u305f\u3060\u3057\u3001memcmp\u306f\u5b9a\u6570\u6642\u9593\u3067\u5b9f\u884c\u3055\u308c\u308b\u4fdd\u8a3c\u304c\u306a\u3044\u305f\u3081\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u6bd4\u8f03\uff08\u30d1\u30b9\u30ef\u30fc\u30c9\u30cf\u30c3\u30b7\u30e5\u306e\u691c\u8a3c\u7b49\uff09\u306b\u306f\u5c02\u7528\u306e\u5b9a\u6570\u6642\u9593\u6bd4\u8f03\u95a2\u6570\uff08crypto_memcmp\u7b49\uff09\u3092\u4f7f\u3046\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">\u6587\u5b57\u5217\u306e\u5185\u5bb9\u6bd4\u8f03<br>\u2192 strcmp<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u7121\u8996<br>\u2192 strcasecmp<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u5148\u982dN\u6587\u5b57\u306e\u307f<br>\u2192 strncmp<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf<br>\u2192 memcmp<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-c-string-compare&#038;blog_slug=cc-c-string-compare\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-c-string-compare&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-05\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">05<\/span>\n  <span class=\"section-label\" style=\"display:block;\">BUG PATTERNS<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u3088\u304f\u3042\u308b\u30d0\u30b0\u30d1\u30bf\u30fc\u30f310\u9078\u3068\u4fee\u6b63\u65b9\u6cd5<\/span>\n  <span class=\"section-desc\">C\u8a00\u8a9e\u306eString\u6bd4\u8f03\u3067\u73fe\u5834\u304c\u983b\u7e41\u306b\u30cf\u30de\u308b\u843d\u3068\u3057\u7a74<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u3067\u306f\u5b9a\u756a\u306e\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e10\u30d1\u30bf\u30fc\u30f3\u3092\u7406\u89e3\u3057\u3066\u304a\u3051\u3070\u3001\u30c7\u30d0\u30c3\u30b0\u6642\u9593\u3092\u5927\u5e45\u306b\u77ed\u7e2e\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f31\uff1a==\u3067\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\nchar s1[] = \"hello\";\nchar s2[] = \"hello\";\nif (s1 == s2) { ... }  \/\/ \u30dd\u30a4\u30f3\u30bf\u6bd4\u8f03\u306b\u306a\u308b\n\n\/\/ OK\nif (strcmp(s1, s2) == 0) { ... }<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f32\uff1astrcmp\u306e\u623b\u308a\u5024\u306e\u610f\u5473\u3092\u9006\u306b\u89e3\u91c8\u3059\u308b<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08\u4e00\u81f4\u3092\u78ba\u8a8d\u3057\u305f\u3044\u306e\u306b\u4e0d\u4e00\u81f4\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\uff09\nif (strcmp(s1, s2)) {\n    printf(\"\u4e00\u81f4\u3057\u307e\u3057\u305f\\n\");  \/\/ \u5b9f\u969b\u306f\u4e0d\u4e00\u81f4\u306e\u3068\u304d\u306b\u5b9f\u884c\u3055\u308c\u308b\n}\n\n\/\/ OK\nif (strcmp(s1, s2) == 0) {\n    printf(\"\u4e00\u81f4\u3057\u307e\u3057\u305f\\n\");\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f33\uff1a\u30cc\u30eb\u6587\u5b57\u304c\u4ed8\u3044\u3066\u3044\u306a\u3044\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08\u30cc\u30eb\u6587\u5b57\u304c\u306a\u3044\u3068strcmp\u304c\u3069\u3053\u307e\u3067\u3082\u8aad\u307f\u7d9a\u3051\u308b\uff09\nchar s[5] = {'h', 'e', 'l', 'l', 'o'};  \/\/ \u30cc\u30eb\u6587\u5b57\u304c\u306a\u3044\uff01\nstrcmp(s, \"hello\");  \/\/ \u672a\u5b9a\u7fa9\u52d5\u4f5c\uff08\u30d0\u30c3\u30d5\u30a1\u5916\u3092\u8aad\u3080\uff09\n\n\/\/ OK\nchar s[6] = {'h', 'e', 'l', 'l', 'o', '\\0'};  \/\/ \u30cc\u30eb\u6587\u5b57\u3092\u660e\u793a\n\/\/ \u307e\u305f\u306f\nchar s[] = \"hello\";  \/\/ \u30ea\u30c6\u30e9\u30eb\u306f\u81ea\u52d5\u7684\u306b\u30cc\u30eb\u6587\u5b57\u304c\u4ed8\u304f<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f34\uff1aNULL\u30dd\u30a4\u30f3\u30bf\u3092strcmp\u306b\u6e21\u3059<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08NULL\u3092strcmp\u306b\u6e21\u3059\u3068\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\uff09\nchar *s = NULL;\nif (strcmp(s, \"hello\") == 0) { ... }  \/\/ SEGFAULT\n\n\/\/ OK\uff08NULL\u30c1\u30a7\u30c3\u30af\u3092\u5148\u306b\u884c\u3046\uff09\nif (s != NULL &amp;&amp; strcmp(s, \"hello\") == 0) { ... }<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f35\uff1astrncmp\u306en=0\u3092\u4f7f\u3046<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ \u6ce8\u610f\uff1an=0\u306estrncmp\u306f\u5e38\u306b0\u3092\u8fd4\u3059\nif (strncmp(s1, s2, 0) == 0) {\n    \/\/ \u5e38\u306btrue\u306b\u306a\u308b\u3002\u610f\u56f3\u3057\u3066\u3044\u305f\u6bd4\u8f03\u306f\u884c\u308f\u308c\u306a\u3044\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f36\uff1a\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u8d85\u3048\u305fstrncmp\u306en\u6307\u5b9a<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08buffer\u306e\u30b5\u30a4\u30ba\u3092\u8d85\u3048\u305fn\u6307\u5b9a\uff09\nchar buffer[10];\nstrncmp(buffer, \"very long string here\", 50);  \/\/ buffer\u306f10\u30d0\u30a4\u30c8\u3057\u304b\u306a\u3044\n\n\/\/ OK\uff08\u5c0f\u3055\u3044\u65b9\u306e\u30b5\u30a4\u30ba\u3092\u4f7f\u3046\uff09\nstrncmp(buffer, \"target\", sizeof(buffer) - 1);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f37\uff1astrcasecmp\u3092Windows\u3067\u4f7f\u304a\u3046\u3068\u3059\u308b<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08Windows\u306eMSVC\u3067\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09\n#include &lt;strings.h&gt;\nstrcasecmp(s1, s2);\n\n\/\/ OK\uff08\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u5bfe\u5fdc\u30de\u30af\u30ed\u3092\u4f7f\u3046\uff09\n#ifdef _WIN32\n    #define strcasecmp _stricmp\n#else\n    #include &lt;strings.h&gt;\n#endif\nstrcasecmp(s1, s2);  \/\/ \u3053\u308c\u306a\u3089\u4e21\u65b9\u3067\u52d5\u304f<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f38\uff1astrlen\u306e\u623b\u308a\u5024\u3092size_t\u578b\u3067\u6271\u308f\u306a\u3044<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08size_t\u306funsigned\u306a\u306e\u3067\u30010\u304b\u3089\u5f15\u304f\u3068\u5927\u304d\u306a\u6b63\u306e\u6570\u306b\u306a\u308b\uff09\nint n = strlen(s1) - strlen(s2);  \/\/ s2\u304c\u9577\u3051\u308c\u3070\u5de8\u5927\u306a\u6570\u306b\u306a\u308b\nif (n &lt; 0) { ... }  \/\/ \u610f\u56f3\u901a\u308a\u306b\u52d5\u304b\u306a\u3044\n\n\/\/ OK\uff08\u578b\u3092\u610f\u8b58\u3059\u308b\uff09\nsize_t len1 = strlen(s1);\nsize_t len2 = strlen(s2);\nif (len1 &lt; len2) { printf(\"s1\u306e\u65b9\u304c\u77ed\u3044\\n\"); }\nelse if (len1 &gt; len2) { printf(\"s1\u306e\u65b9\u304c\u9577\u3044\\n\"); }\nelse { \/* \u9577\u3055\u304c\u540c\u3058 *\/ }<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f39\uff1a\u521d\u671f\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u914d\u5217\u3092\u6bd4\u8f03\u3059\u308b<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08\u672a\u521d\u671f\u5316\u306e\u914d\u5217\u306f\u30e9\u30f3\u30c0\u30e0\u306a\u30c7\u30fc\u30bf\u304c\u5165\u3063\u3066\u3044\u308b\uff09\nchar buffer[100];  \/\/ \u521d\u671f\u5316\u306a\u3057\nif (strcmp(buffer, \"hello\") == 0) { ... }  \/\/ \u672a\u5b9a\u7fa9\u52d5\u4f5c\n\n\/\/ OK\uff08memset\u3067\u521d\u671f\u5316\uff09\nchar buffer[100];\nmemset(buffer, 0, sizeof(buffer));  \/\/ \u5168\u30d0\u30a4\u30c8\u30920\u3067\u521d\u671f\u5316<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f310\uff1aUnicode\u30fb\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u3092char*\u3067\u6bd4\u8f03\u3059\u308b<\/h3>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\">\/\/ NG\uff08\u65e5\u672c\u8a9e\u7b49\u306e\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u3092strcmp\u3067\u6bd4\u8f03\u3059\u308b\u3068\u6587\u5b57\u5316\u3051\u3084\u8aa4\u5224\u5b9a\uff09\nchar japanese[] = \"\u3053\u3093\u306b\u3061\u306f\";\nif (strcmp(japanese, \"\u3053\u3093\u306b\u3061\u306f\") == 0) { ... }  \/\/ \u52d5\u304f\u304c\u79fb\u690d\u6027\u306b\u554f\u984c\n\n\/\/ OK\uff08\u30ef\u30a4\u30c9\u6587\u5b57\u5217\u3092\u4f7f\u3046\uff09\n#include &lt;wchar.h&gt;\nwchar_t ws1[] = L\"\u3053\u3093\u306b\u3061\u306f\";\nwchar_t ws2[] = L\"\u3053\u3093\u306b\u3061\u306f\";\nif (wcscmp(ws1, ws2) == 0) { ... }<\/code><\/pre>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u30d0\u30b0\u306e\u5927\u534a\u306f\u30d1\u30bf\u30fc\u30f31\uff08==\u3067\u306e\u6bd4\u8f03\uff09\u3068\u30d1\u30bf\u30fc\u30f34\uff08NULL\u30dd\u30a4\u30f3\u30bf\uff09\u3067\u3059\u3002\u3053\u306e2\u3064\u3092\u78ba\u8a8d\u3059\u308b\u3060\u3051\u3067\u3001\u6587\u5b57\u5217\u6bd4\u8f03\u306b\u95a2\u9023\u3059\u308b\u30d0\u30b0\u306e80%\u4ee5\u4e0a\u304c\u767a\u898b\u3067\u304d\u307e\u3059\u3002\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-c-string-compare&#038;blog_slug=cc-c-string-compare\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-c-string-compare&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-06\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">06<\/span>\n  <span class=\"section-label\" style=\"display:block;\">CLAUDE CODE<\/span>\n  <span class=\"section-title\" style=\"display:block;\">Claude Code\u3067C\u306e\u30d0\u30b0\u3092\u5373\u8a3a\u65ad\u30fb\u4fee\u6b63\u3059\u308b\u65b9\u6cd5<\/span>\n  <span class=\"section-desc\">\u624b\u52d5\u30c7\u30d0\u30c3\u30b0\u306e10\u5206\u306e1\u306e\u6642\u9593\u3067\u6839\u672c\u539f\u56e0\u3092\u7279\u5b9a<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u8a00\u8a9e\u306e\u30d0\u30b0\uff08\u7279\u306b\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\u30fb\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\uff09\u306f\u539f\u56e0\u7279\u5b9a\u304c\u96e3\u3057\u304f\u3001\u719f\u7df4\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u8abf\u67fb\u306b\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002Claude Code\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u8a3a\u65ad\u30d7\u30ed\u30bb\u30b9\u3092\u5927\u5e45\u306b\u9ad8\u901f\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\u306e\u539f\u56e0\u3092Claude Code\u3067\u7279\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u300cSegmentation fault (core dumped)\u300d\u304c\u51fa\u305f\u3068\u304d\u3001Claude Code\u306b\u30b3\u30fc\u30c9\u3092\u6e21\u3057\u3066\u300c\u3053\u306eC\u30b3\u30fc\u30c9\u306e\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\u306e\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3066\u4fee\u6b63\u3057\u3066\u300d\u3068\u6307\u793a\u3059\u308b\u3060\u3051\u3067\u3001\u539f\u56e0\u5206\u6790\u304c\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\"># Claude Code\u3078\u306e\u6307\u793a\u4f8b\n\u300c\u4ee5\u4e0b\u306eC\u30b3\u30fc\u30c9\u3067Segfault\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u3002\n\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3001\u4fee\u6b63\u5f8c\u306e\u5b89\u5168\u306a\u30b3\u30fc\u30c9\u3092\u63d0\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n\u7279\u306bNULL\u30dd\u30a4\u30f3\u30bf\u30fb\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u30fb\n\u672a\u521d\u671f\u5316\u5909\u6570\u30fb\u30cc\u30eb\u6587\u5b57\u6b20\u843d\u306e\u89b3\u70b9\u3067\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n\n[\u3053\u3053\u306bC\u30b3\u30fc\u30c9\u3092\u8cbc\u308a\u4ed8\u3051\u308b]\u300d<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u5217\u6bd4\u8f03\u30d0\u30b0\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5168\u4f53\u3067\u30b9\u30ad\u30e3\u30f3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5168\u4f53\u306eC\u30b3\u30fc\u30c9\u3092\u5bfe\u8c61\u306b\u300c==\u3092\u4f7f\u3063\u305f\u6587\u5b57\u5217\u6bd4\u8f03\u3092\u5168\u3066\u898b\u3064\u3051\u3066strcmp\u306b\u4fee\u6b63\u3057\u3066\u300d\u3068\u3044\u3046\u6307\u793a\u3092Claude Code\u306b\u4e0e\u3048\u308b\u3053\u3068\u3067\u3001\u624b\u52d5grep\u3068\u306f\u6bd4\u3079\u7269\u306b\u306a\u3089\u306a\u3044\u7cbe\u5ea6\u3067\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u3092\u691c\u51fa\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre style=\"background:#1e1e2e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><code style=\"color:#cdd6f4;font-family:'Courier New',monospace;font-size:14px;line-height:1.7;\"># Claude Code\u3078\u306e\u6307\u793a\u4f8b\n\u300c\u3053\u306eC\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u5168\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3093\u3067\u3001\n\u4ee5\u4e0b\u306e\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u3092\u5168\u3066\u691c\u51fa\u3057\u3066\u4fee\u6b63\u6848\u3092\u63d0\u793a\u3057\u3066\u304f\u3060\u3055\u3044\uff1a\n1. ==\u6f14\u7b97\u5b50\u3067char\u30dd\u30a4\u30f3\u30bf\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u7b87\u6240\n2. NULL\u30c1\u30a7\u30c3\u30af\u306a\u3057\u3067strlen\/strcmp\u3092\u547c\u3093\u3067\u3044\u308b\u7b87\u6240\n3. strncmp\u3092\u4f7f\u308f\u305astrcmp\u3067\u5916\u90e8\u5165\u529b\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u7b87\u6240\n4. \u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u8d85\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308bstrncmp\u306en\u6307\u5b9a\u300d<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Claude Code\u306b\u3088\u308b\u9759\u7684\u89e3\u6790\u3068valgrind\u306e\u9023\u643a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">valgrind\u306f\u5b9f\u884c\u6642\u306e\u30e1\u30e2\u30ea\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3059\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002Claude Code\u306fvalgrind\u306e\u51fa\u529b\u3092\u8aad\u307f\u8fbc\u3093\u3067\u300c\u3053\u306evalgrind\u306e\u51fa\u529b\u304c\u793a\u3059\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u30fb\u30d0\u30c3\u30d5\u30a1\u8aad\u307f\u8d8a\u3057\u306e\u30b3\u30fc\u30c9\u4e0a\u306e\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3066\u4fee\u6b63\u3057\u3066\u300d\u3068\u3044\u3046\u5f62\u3067\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u958b\u767a\u74b0\u5883\u306bvalgrind\u304c\u3042\u308b\u5834\u5408\u3001Claude Code\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067C\u306e\u30e1\u30e2\u30ea\u95a2\u9023\u30d0\u30b0\u306e\u30c7\u30d0\u30c3\u30b0\u52b9\u7387\u304c\u5287\u7684\u306b\u5411\u4e0a\u3057\u307e\u3059\u3002\u7279\u306b\u5927\u898f\u6a21\u306aC\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u300c\u3069\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u4f55\u884c\u76ee\u306estrcmp\u304cNULL\u30c1\u30a7\u30c3\u30af\u3092\u6b20\u843d\u3055\u305b\u3066\u3044\u308b\u304b\u300d\u3092\u4eba\u624b\u3067\u8abf\u3079\u308b\u306e\u306f\u81a8\u5927\u306a\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u304c\u3001Claude Code\u306b\u300c\u5168\u30bd\u30fc\u30b9\u3092\u8aad\u3093\u3067NULL\u30dd\u30a4\u30f3\u30bf\u306e\u30ea\u30b9\u30af\u304c\u3042\u308b\u6587\u5b57\u5217\u6bd4\u8f03\u3092\u5168\u3066\u5217\u6319\u3057\u3066\u300d\u3068\u6307\u793a\u3059\u308b\u3053\u3068\u3067\u6570\u5206\u3067\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>valgrind<\/strong>\uff1aLinux\u3067C\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30e1\u30e2\u30ea\u95a2\u9023\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3059\u308b\u52d5\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u306a\u304c\u3089\u300c\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\uff08\u78ba\u4fdd\u3057\u305f\u30e1\u30e2\u30ea\u3092\u89e3\u653e\u3057\u306a\u3044\uff09\u300d\u300c\u7121\u52b9\u306a\u30e1\u30e2\u30ea\u30a2\u30af\u30bb\u30b9\uff08\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u30fbNULL\u30dd\u30a4\u30f3\u30bf\u53c2\u7167\uff09\u300d\u300c\u672a\u521d\u671f\u5316\u30e1\u30e2\u30ea\u306e\u4f7f\u7528\u300d\u306a\u3069\u3092\u81ea\u52d5\u691c\u51fa\u3059\u308b\u3002\u300cvalgrind .\/myprogram\u300d\u3068\u3044\u3046\u30b3\u30de\u30f3\u30c9\u3067\u5b9f\u884c\u3059\u308b\u3060\u3051\u3067\u4f7f\u3048\u308b\u305f\u3081\u3001C\u8a00\u8a9e\u958b\u767a\u306e\u5fc5\u9808\u30c4\u30fc\u30eb\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u308b\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:linear-gradient(135deg,#1a1a1a,#2a1015);border-radius:12px;padding:20px 24px;margin:24px 0;display:flex;align-items:center;gap:16px;color:#fff;\">\n  <span style=\"font-size:36px;\">&#127942;<\/span>\n  <div>\n    <div style=\"font-size:13px;color:#dc2626;font-weight:700;letter-spacing:1px;\">VERDICT<\/div>\n    <div style=\"font-size:18px;font-weight:800;\">Claude Code\u6d3b\u7528\u3092\u63a8\u5968<\/div>\n    <div style=\"font-size:14px;color:rgba(255,255,255,0.7);margin-top:4px;\">C\u8a00\u8a9e\u306eString\u6bd4\u8f03\u30d0\u30b0\u306e\u81ea\u52d5\u691c\u51fa\u30fb\u4fee\u6b63\u30fb\u30bb\u30b0\u30d5\u30a9\u30eb\u30c8\u8a3a\u65ad\u306b\u306fClaude Code\u304c\u6700\u901f\u3002\u624b\u52d5\u30ec\u30d3\u30e5\u30fc\u306e10\u5206\u306e1\u306e\u6642\u9593\u3067\u5168\u30bd\u30fc\u30b9\u3092\u30b9\u30ad\u30e3\u30f3\u5b8c\u4e86\u3002<\/div>\n  <\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">Claude Code\u306f\u300c\u3053\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u610f\u5473\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u300d\u3068\u3044\u3046\u8cea\u554f\u3060\u3051\u3067\u3082\u975e\u5e38\u306b\u6709\u7528\u3067\u3059\u304c\u3001\u300c\u3053\u306e\u30b3\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3093\u3067\u30d0\u30b0\u3092\u63a2\u3057\u3066\u4fee\u6b63\u3057\u3066\u304f\u3060\u3055\u3044\u300d\u3068\u3044\u3046\u4f7f\u3044\u65b9\u304c\u6700\u3082\u52b9\u679c\u7684\u3067\u3059\u3002\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3060\u3051\u3067\u306a\u304f\u30b3\u30fc\u30c9\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u307e\u3067\u542b\u3081\u3066\u5206\u6790\u3067\u304d\u308b\u305f\u3081\u3001\u8868\u9762\u7684\u306a\u30a8\u30e9\u30fc\u306e\u6839\u672c\u539f\u56e0\u307e\u3067\u6398\u308a\u4e0b\u3052\u3066\u304f\u308c\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">C\u8a00\u8a9e\u306e\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9\u30c6\u30e0\u306e\u54c1\u8cea\u6539\u5584\u30fbClaude Code\u3092\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u81ea\u52d5\u30ec\u30d3\u30e5\u30fc\u5c0e\u5165\u306b\u3064\u3044\u3066\u3001\u5f0a\u793eAI\u9b3c\u7ba1\u7406\u3067\u306f\u500b\u5225\u76f8\u8ac7\u3092\u627f\u3063\u3066\u3044\u307e\u3059\u3002C\u8a00\u8a9e\u306e\u7d44\u307f\u8fbc\u307f\u30b7\u30b9\u30c6\u30e0\u30fb\u57fa\u5e79\u30b7\u30b9\u30c6\u30e0\u306eAI\u6d3b\u7528\u306b\u3064\u3044\u3066\u3082\u3054\u76f8\u8ac7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div style=\"background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);border-radius:16px;padding:36px 32px;margin:48px 0 16px;color:#fff;\">\n  <p style=\"font-size:13px;font-weight:700;color:#dc2626;letter-spacing:2px;margin:0 0 12px;\">NEXT STEP<\/p>\n  <p style=\"font-size:22px;font-weight:800;line-height:1.5;margin:0 0 20px;\">\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9\u3092\u3001\u3042\u306a\u305f\u306e\u30d3\u30b8\u30cd\u30b9\u3067<br>\u5b9f\u8df5\u3057\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<\/p>\n  <div style=\"background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:12px;padding:24px;max-width:560px;margin:0 auto;\">\n    <p style=\"font-size:13px;color:#dc2626;font-weight:700;margin:0 0 8px;\">AI\u6d3b\u7528\u3092\u81ea\u793e\u3067\u56de\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044\u65b9\u3078<\/p>\n    <p style=\"font-size:20px;font-weight:800;margin:0 0 12px;\">AI\u9b3c\u7ba1\u7406<\/p>\n    <p style=\"font-size:14px;color:rgba(255,255,255,0.75);margin:0 0 20px;line-height:1.7;\">Claude Code\u30fbCowork\u5c0e\u5165\u652f\u63f4\u304b\u3089\u696d\u52d9\u8a2d\u8a08\u30fb\u793e\u5185\u6d78\u900f\u307e\u3067\u5b9f\u8df5\u30d9\u30fc\u30b9\u3067\u4f34\u8d70\u3002\u300c\u81ea\u793e\u3067\u56de\u305b\u308b\u7d44\u7e54\u300d\u309290\u65e5\u3067\u4f5c\u308b\u7d4c\u55b6\u8005\u5411\u3051\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3002<\/p>\n    <div style=\"text-align:center;\">\n      <a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&utm_medium=article&utm_campaign=cc-c-string-compare&utm_content=next-step-cta\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#dc2626;color:#fff;font-weight:700;font-size:15px;padding:14px 32px;border-radius:30px;text-decoration:none;\">AI\u9b3c\u7ba1\u7406\u3092\u8a73\u3057\u304f\u898b\u308b \u2192<\/a>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Q. C\u8a00\u8a9e\u3067strcmp\u3068strncmp\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u5916\u90e8\u304b\u3089\u306e\u5165\u529b\uff08\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u30fb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c7\u30fc\u30bf\u30fb\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u306e\u8aad\u307f\u8fbc\u307f\uff09\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306f\u5fc5\u305astrncmp\u3092\u4f7f\u3044\u3001\u6bd4\u8f03\u3059\u308b\u6700\u5927\u6587\u5b57\u6570\u3092\u660e\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b3\u30fc\u30c9\u5185\u306e\u5b9a\u6570\u30ea\u30c6\u30e9\u30eb\u3068\u306e\u6bd4\u8f03\u306a\u3069\u3001\u9577\u3055\u304c\u4fdd\u8a3c\u3067\u304d\u308b\u5834\u5408\u306fstrcmp\u3067\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u8ff7\u3063\u305f\u3089strncmp\u3068\u3044\u3046\u65b9\u91dd\u304c\u6700\u3082\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. C\u8a00\u8a9e\u3067\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3057\u3066\u6587\u5b57\u5217\u6bd4\u8f03\u3059\u308b\u306b\u306f\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. Linux\u30fbmacOS\u3067\u306fstrcasecmp()\uff08strings.h\u3092\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\uff09\u304c\u4f7f\u3048\u307e\u3059\u3002Windows\u3067\u306f_stricmp()\uff08string.h\uff09\u3092\u4f7f\u3044\u307e\u3059\u3002\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5834\u5408\u306f\u3001#ifdef\u30de\u30af\u30ed\u3067\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u5224\u5b9a\u3057\u3066\u3069\u3061\u3089\u304b\u306b\u5207\u308a\u66ff\u3048\u308b\u304b\u3001tolower()\u3092\u4f7f\u3063\u3066\u6bd4\u8f03\u524d\u306b\u6587\u5b57\u5217\u3092\u5c0f\u6587\u5b57\u306b\u5909\u63db\u3059\u308b\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. C\u8a00\u8a9e\u3067strcmp\u304c\u3042\u308b\u306e\u306bmemcmp\u304c\u5fc5\u8981\u306a\u7406\u7531\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. strcmp\u306f\u30cc\u30eb\u6587\u5b57\uff08\\0\uff09\u3067\u6bd4\u8f03\u3092\u505c\u6b62\u3057\u307e\u3059\u304c\u3001memcmp\u306f\u6307\u5b9a\u3057\u305f\u30d0\u30a4\u30c8\u6570\u3092\u305d\u306e\u307e\u307e\u6bd4\u8f03\u3057\u307e\u3059\u3002\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u30fb\u30cc\u30eb\u6587\u5b57\u3092\u542b\u3080\u30c7\u30fc\u30bf\u30fb\u56fa\u5b9a\u9577\u30d5\u30a3\u30fc\u30eb\u30c9\u306a\u3069\u300c\u30c6\u30ad\u30b9\u30c8\u6587\u5b57\u5217\u3067\u306a\u3044\u30c7\u30fc\u30bf\u300d\u3092\u6bd4\u8f03\u3059\u308b\u306b\u306fmemcmp\u304c\u5fc5\u8981\u3067\u3059\u3002\u4f8b\u3048\u3070\u30cf\u30c3\u30b7\u30e5\u5024\uff08sha256\u306f32\u30d0\u30a4\u30c8\u306e\u30d0\u30a4\u30ca\u30ea\uff09\u306e\u6bd4\u8f03\u306bstrcmp\u3092\u4f7f\u3046\u3068\u3001\u6700\u521d\u306e\\0\u30d0\u30a4\u30c8\u3067\u6bd4\u8f03\u304c\u6b62\u307e\u308a\u6b63\u3057\u304f\u52d5\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. C\u8a00\u8a9e\u306estrcmp\u3067\u65e5\u672c\u8a9e\uff08\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\uff09\u3092\u6bd4\u8f03\u3067\u304d\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u6280\u8853\u7684\u306b\u306fstrcmp\u3067\u65e5\u672c\u8a9e\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3067\u304d\u307e\u3059\u304c\u3001\u79fb\u690d\u6027\u306e\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002UTF-8\u30a8\u30f3\u30b3\u30fc\u30c9\u306e\u65e5\u672c\u8a9e\u306fstrcmp\u3067\u52d5\u304f\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u304c\u3001Shift-JIS\u3084EUC\u7b49\u306e\u30ed\u30b1\u30fc\u30eb\u4f9d\u5b58\u30a8\u30f3\u30b3\u30fc\u30c9\u3067\u306f\u8aa4\u52d5\u4f5c\u3059\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u30ef\u30a4\u30c9\u6587\u5b57\uff08wchar_t\uff09\u3092\u4f7f\u3063\u3066wcscmp()\u3067\u6bd4\u8f03\u3059\u308b\u304b\u3001\u30ed\u30b1\u30fc\u30eb\u5bfe\u5fdc\u306estrcoll()\u3092\u4f7f\u3046\u65b9\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Claude Code\u306fC\u8a00\u8a9e\u306e\u30c7\u30d0\u30c3\u30b0\u306b\u672c\u5f53\u306b\u4f7f\u3048\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u306f\u3044\u3001\u7279\u306b\u300c\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u306e\u691c\u51fa\u3068\u4fee\u6b63\u63d0\u6848\u300d\u300c\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u30fbvalgrind\u51fa\u529b\u306e\u89e3\u6790\u300d\u300c\u30ec\u30ac\u30b7\u30fcC\u30b3\u30fc\u30c9\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u300d\u306b\u975e\u5e38\u306b\u6709\u52b9\u3067\u3059\u3002\u30b3\u30fc\u30c9\u3092Claude Code\u306b\u6e21\u3057\u3066\u300c\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\u306e\u539f\u56e0\u3092\u63a2\u3057\u3066\u300d\u300c==\u3067char\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u7b87\u6240\u3092\u5168\u3066\u691c\u51fa\u3057\u3066\u300d\u3068\u3044\u3063\u305f\u6307\u793a\u3092\u4e0e\u3048\u308b\u3053\u3068\u3067\u3001\u624b\u52d5\u8abf\u67fb\u3067\u306f\u6642\u9593\u304c\u304b\u304b\u308b\u4f5c\u696d\u3092\u77ed\u6642\u9593\u3067\u5b8c\u4e86\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. \u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\uff08Segfault\uff09\u3068\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u30d5\u30a9\u30eb\u30c8\uff08SIGSEGV\uff09\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u300c\u30a2\u30af\u30bb\u30b9\u3057\u3066\u306f\u3044\u3051\u306a\u3044\u30e1\u30e2\u30ea\u9818\u57df\u300d\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3059\u308bOS\u304b\u3089\u306e\u30a8\u30e9\u30fc\u30b7\u30b0\u30ca\u30eb\u3067\u3059\u3002\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306f\u305d\u306e\u539f\u56e0\u306e\u4e00\u3064\u3067\u300c\u914d\u5217\u306e\u5883\u754c\u3092\u8d85\u3048\u3066\u30e1\u30e2\u30ea\u306b\u66f8\u304d\u8fbc\u3080\u300d\u3053\u3068\u3067\u30bb\u30b0\u30d5\u30a9\u30eb\u30c8\u3084\u4ed6\u306e\u672a\u5b9a\u7fa9\u52d5\u4f5c\u304c\u8d77\u304d\u307e\u3059\u3002NULL\u30dd\u30a4\u30f3\u30bf\u53c2\u7167\u3082\u30bb\u30b0\u30d5\u30a9\u30eb\u30c8\u306e\u5178\u578b\u7684\u306a\u539f\u56e0\u3067\u3059\u3002valgrind\u3084Claude Code\u3092\u4f7f\u3063\u305f\u89e3\u6790\u3067\u6839\u672c\u539f\u56e0\u3092\u7279\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u6bd4\u8f03\u3068\u73fe\u4ee3\u306eAI\u30c4\u30fc\u30eb\u306f\u95a2\u4fc2\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. C\u8a00\u8a9e\u3067\u66f8\u304b\u308c\u305f\u7d44\u307f\u8fbc\u307f\u30b7\u30b9\u30c6\u30e0\u30fbOS\u30ab\u30fc\u30cd\u30eb\u30fb\u57fa\u5e79\u30b7\u30b9\u30c6\u30e0\u306f\u73fe\u5728\u3082\u591a\u304f\u7a3c\u50cd\u3057\u3066\u3044\u307e\u3059\u3002Claude Code\u306f\u3053\u308c\u3089\u306e\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9\u30c6\u30e0\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u30fb\u30d0\u30b0\u4fee\u6b63\u30fb\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306b\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001AI\u3084\u6a5f\u68b0\u5b66\u7fd2\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\uff08TensorFlow\u7b49\u306e\u30b3\u30a2C++\u90e8\u5206\uff09\u306e\u30c7\u30d0\u30c3\u30b0\u306b\u3082\u540c\u69d8\u306e\u624b\u6cd5\u304c\u4f7f\u3048\u307e\u3059\u3002\u300cC\u8a00\u8a9e\u306e\u5c02\u9580\u77e5\u8b58\u304c\u306a\u304f\u3066\u3082Claude Code\u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u300d\u3068\u3044\u3046\u5f62\u3067\u3001AI\u304cC\u30b7\u30b9\u30c6\u30e0\u306e\u4fdd\u5b88\u30b3\u30b9\u30c8\u3092\u5927\u5e45\u306b\u4e0b\u3052\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u8a00\u8a9e\u3067strcmp\u3068strncmp\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u5916\u90e8\u304b\u3089\u306e\u5165\u529b\uff08\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u30fb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c7\u30fc\u30bf\u30fb\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u306e\u8aad\u307f\u8fbc\u307f\uff09\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306f\u5fc5\u305astrncmp\u3092\u4f7f\u3044\u3001\u6bd4\u8f03\u3059\u308b\u6700\u5927\u6587\u5b57\u6570\u3092\u660e\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b3\u30fc\u30c9\u5185\u306e\u5b9a\u6570\u30ea\u30c6\u30e9\u30eb\u3068\u306e\u6bd4\u8f03\u306a\u3069\u3001\u9577\u3055\u304c\u4fdd\u8a3c\u3067\u304d\u308b\u5834\u5408\u306fstrcmp\u3067\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u8ff7\u3063\u305f\u3089strncmp\u3068\u3044\u3046\u65b9\u91dd\u304c\u6700\u3082\u5b89\u5168\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u8a00\u8a9e\u3067\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3057\u3066\u6587\u5b57\u5217\u6bd4\u8f03\u3059\u308b\u306b\u306f\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Linux\u30fbmacOS\u3067\u306fstrcasecmp()\uff08strings.h\u3092\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\uff09\u304c\u4f7f\u3048\u307e\u3059\u3002Windows\u3067\u306f_stricmp()\uff08string.h\uff09\u3092\u4f7f\u3044\u307e\u3059\u3002\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5834\u5408\u306f\u3001#ifdef\u30de\u30af\u30ed\u3067\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u5224\u5b9a\u3057\u3066\u3069\u3061\u3089\u304b\u306b\u5207\u308a\u66ff\u3048\u308b\u304b\u3001tolower()\u3092\u4f7f\u3063\u3066\u6bd4\u8f03\u524d\u306b\u6587\u5b57\u5217\u3092\u5c0f\u6587\u5b57\u306b\u5909\u63db\u3059\u308b\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u8a00\u8a9e\u3067strcmp\u304c\u3042\u308b\u306e\u306bmemcmp\u304c\u5fc5\u8981\u306a\u7406\u7531\u306f\u4f55\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": 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