{"id":63142,"date":"2023-11-24T18:13:39","date_gmt":"2023-11-24T10:13:39","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=63142"},"modified":"2023-11-24T18:13:41","modified_gmt":"2023-11-24T10:13:41","slug":"c-%e8%af%ad%e8%a8%80%e4%b8%ad%ef%bc%8cx-5-4-%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/63142.html","title":{"rendered":"C \u8bed\u8a00\u4e2d\uff0cx\u00a0= 5 == 4 \u662f\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote\">\n<p>\u5728C \u8bed\u8a00\u4e2d\uff0c`x = 5 == 4` \u8868\u793a\u5c06\u903b\u8f91\u8868\u8fbe\u5f0f`5 == 4` \u7684\u7ed3\u679c\uff08\u5373`false` \u6216`0`\uff09\u8d4b\u503c\u7ed9\u53d8\u91cf`x`\u3002\u8fd9\u6837\u7684\u4ee3\u7801\u7247\u6bb5\u53ef\u80fd\u4f1a\u5728\u6761\u4ef6\u5224\u65ad\u6216\u903b\u8f91\u8fd0\u7b97\u65f6\u4f7f\u7528\uff0c\u4ee5\u68c0\u67e5\u67d0\u4e2a\u6761\u4ef6\u662f\u5426\u6210\u7acb\u5e76\u6839\u636e\u7ed3\u679c\u8fdb\u884c\u540e\u7eed\u7684\u64cd\u4f5c\u3002\u4e0b\u9762\uff0c\u8ba9\u6211\u4eec\u6df1\u5165\u63a2\u8ba8\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684\u542b\u4e49\u53ca\u5176\u80cc\u540e\u7684\u8fd0\u4f5c\u673a\u5236\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\u548c\u7ed3\u5408\u6027<\/h2>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u4e2d\uff0c\u9996\u5148\u8981\u7406\u89e3C \u8bed\u8a00\u4e2d\u7684\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\u3002\u5728C \u8bed\u8a00\u4e2d\uff0c`==` \uff08\u76f8\u7b49\u6027\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff09\u7684\u4f18\u5148\u7ea7\u6bd4\u8d4b\u503c\u8fd0\u7b97\u7b26`=` \u4f4e\u3002\u56e0\u6b64\uff0c\u8868\u8fbe\u5f0f\u4f1a\u6309\u7167\u5176\u4f18\u5148\u7ea7\u8fdb\u884c\u8ba1\u7b97\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. `5 == 4` \u7684\u7ed3\u679c<\/h2>\n\n\n\n<p>`5 == 4` \u662f\u4e00\u4e2a\u903b\u8f91\u8868\u8fbe\u5f0f\uff0c\u7528\u4e8e\u68c0\u67e55 \u662f\u5426\u7b49\u4e8e4\u3002\u5728\u8fd9\u4e2a\u7279\u5b9a\u7684\u4f8b\u5b50\u4e2d\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u5373`false`\u3002\u56e0\u4e3a5 \u4e0d\u7b49\u4e8e4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u8d4b\u503c\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n<p>\u4e00\u65e6\u903b\u8f91\u8868\u8fbe\u5f0f`5 == 4` \u8fd4\u56de\u4e86\u5e03\u5c14\u503c`false`\uff0c\u90a3\u4e48\u6574\u4e2a\u8868\u8fbe\u5f0f\u5c31\u53d8\u6210\u4e86`x = false`\u3002\u5728C \u8bed\u8a00\u4e2d\uff0c\u5e03\u5c14\u503c`false` \u88ab\u89e3\u91ca\u4e3a\u6574\u6570\u503c`0`\uff0c\u56e0\u6b64\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u5b9e\u9645\u4e0a\u5c31\u662f\u5c06`0` \u8d4b\u503c\u7ed9\u53d8\u91cf`x`\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u8868\u8fbe\u5f0f\u7684\u8bc4\u4f30<\/h2>\n\n\n\n<p>\u6839\u636eC \u8bed\u8a00\u4e2d\u7684\u8fd0\u7b97\u89c4\u5219\uff0c\u8868\u8fbe\u5f0f\u7684\u8ba1\u7b97\u662f\u4ece\u53f3\u5411\u5de6\u8fdb\u884c\u7684\u3002\u56e0\u6b64\uff0c\u5728`5 == 4` \u4e3a`false`\uff08\u6216`0`\uff09\u540e\uff0c\u5176\u7ed3\u679c\u88ab\u8d4b\u503c\u7ed9\u53d8\u91cf`x`\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u5b9e\u9645\u793a\u4f8b<\/h2>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684C \u8bed\u8a00\u793a\u4f8b\uff0c\u8bf4\u660e\u4e86`x = 5 == 4` \u7684\u8fd0\u884c\u673a\u5236\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n\nint m<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>n() {\n    int x;\n    x = 5 == 4;\n    printf(\"x \u7684\u503c\u4e3a\uff1a%d\\n\", x);\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u7406\u89e3C \u8bed\u8a00\u4e2d\u7684\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\u548c\u8868\u8fbe\u5f0f\u7684\u8ba1\u7b97\u987a\u5e8f\u5bf9\u4e8e\u6b63\u786e\u89e3\u8bfb\u7c7b\u4f3c\u4e8e`x = 5 == 4` \u7684\u8868\u8fbe\u5f0f\u81f3\u5173\u91cd\u8981\u3002\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u5bf9\u4e8e\u8fd9\u79cd\u8bed\u6cd5\u7684\u7406\u89e3\u6709\u52a9\u4e8e\u7f16\u5199\u66f4\u6e05\u6670\u548c\u53ef\u8bfb\u6027\u66f4\u5f3a\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"484\" height=\"300\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/11\/263088-C\u8bed\u8a00\u4e2dx54\u662f\u4ec0\u4e48\u610f\u601d.png?x-oss-process=image\/auto-orient,1\/format,webp\" class=\"aligncenter\" alt=\"C \u8bed\u8a00\u4e2d\uff0cx\u00a0= 5 == 4 \u662f\u4ec0\u4e48\u610f\u601d\" \/><\/p>\n\n\n\n<p><strong>\u5e38\u89c1\u95ee\u7b54\uff1a<\/strong><\/p>\n\n\n\n<ul>\n<li>\u95ee\uff1a\u5728C\u8bed\u8a00\u4e2d\uff0c`x = 5 == 4`\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/li>\n\n\n\n<li>\u7b54\uff1a\u5728C\u8bed\u8a00\u4e2d\uff0c\u8868\u8fbe\u5f0f`x = 5 == 4`\u7684\u7ed3\u679c\u662f`x`\u88ab\u8d4b\u503c\u4e3a0\u3002\u8fd9\u662f\u56e0\u4e3a`==`\u8fd0\u7b97\u7b26\u6bd4`=`\u8fd0\u7b97\u7b26\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7\uff0c\u6240\u4ee5\u9996\u5148\u6bd4\u8f83`5 == 4`\uff0c\u7ed3\u679c\u4e3a\u5047\uff08false\uff09\uff0c\u5728C\u8bed\u8a00\u4e2d\u75280\u8868\u793a\u3002\u56e0\u6b64\uff0c\u6574\u4e2a\u8868\u8fbe\u5f0f\u7b49\u540c\u4e8e`x = 0`\u3002<\/li>\n<\/ul>\n\n\n\n<ul>\n<li>\u95ee\uff1a\u4e3a\u4ec0\u4e48`5 == 4`\u5728C\u8bed\u8a00\u4e2d\u88ab\u89c6\u4e3a\u5047\uff1f<\/li>\n\n\n\n<li>\u7b54\uff1a\u5728C\u8bed\u8a00\u4e2d\uff0c\u4efb\u4f55\u975e\u96f6\u503c\u88ab\u89c6\u4e3a\u771f\uff08true\uff09\uff0c\u800c0\u88ab\u89c6\u4e3a\u5047\uff08false\uff09\u3002\u56e0\u6b64\uff0c\u5f53\u6bd4\u8f83\u4e24\u4e2a\u4e0d\u76f8\u7b49\u7684\u6570\u503c\u65f6\uff0c\u5982`5 == 4`\uff0c\u7ed3\u679c\u662f\u5047\uff0c\u53730\u3002<\/li>\n<\/ul>\n\n\n\n<ul>\n<li>\u95ee\uff1a`x = 5 == 4`\u8868\u8fbe\u5f0f\u4e2d\uff0c\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/li>\n\n\n\n<li>\u7b54\uff1a\u5728C\u8bed\u8a00\u4e2d\uff0c`==`\uff08\u7b49\u4e8e\uff09\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e`=`\uff08\u8d4b\u503c\uff09\u8fd0\u7b97\u7b26\u3002\u56e0\u6b64\uff0c\u5728\u8868\u8fbe\u5f0f`x = 5 == 4`\u4e2d\uff0c\u9996\u5148\u6267\u884c`5 == 4`\u7684\u6bd4\u8f83\uff0c\u5176\u7ed3\u679c\uff080\u62161\uff09\u968f\u540e\u88ab\u8d4b\u503c\u7ed9\u53d8\u91cf`x`\u3002<\/li>\n<\/ul>\n\n\n\n<ul>\n<li>\u95ee\uff1a\u5982\u679c\u60f3\u5148\u6267\u884c\u8d4b\u503c\u64cd\u4f5c\uff0c\u5e94\u8be5\u5982\u4f55\u4fee\u6539`x = 5 == 4`\u8fd9\u4e2a\u8868\u8fbe\u5f0f\uff1f<\/li>\n\n\n\n<li>\u7b54\uff1a\u5982\u679c\u5e0c\u671b\u5728\u8868\u8fbe\u5f0f\u4e2d\u5148\u6267\u884c\u8d4b\u503c\u64cd\u4f5c\uff0c\u53ef\u4ee5\u4f7f\u7528\u62ec\u53f7\u6765\u6539\u53d8\u4f18\u5148\u7ea7\uff0c\u4f8b\u5982`x = (5 == 4)`\u3002\u867d\u7136\u8fd9\u5728\u903b\u8f91\u4e0a\u6ca1\u6709\u53d8\u5316\uff0c\u56e0\u4e3a`5 == 4`\u4ecd\u7136\u662f\u5047\uff0c\u4f46\u62ec\u53f7\u4f7f\u5f97\u8868\u8fbe\u5f0f\u7684\u7ed3\u6784\u548c\u6267\u884c\u987a\u5e8f\u66f4\u52a0\u6e05\u6670\u3002<\/li>\n<\/ul>\n\n\n\n<ul>\n<li>\u95ee\uff1a\u5728C\u8bed\u8a00\u4e2d\uff0c\u5982\u4f55\u6b63\u786e\u7406\u89e3\u590d\u5408\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1f<\/li>\n\n\n\n<li>\u7b54\uff1a\u8981\u6b63\u786e\u7406\u89e3C\u8bed\u8a00\u4e2d\u590d\u5408\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff0c\u5173\u952e\u662f\u8981\u4e86\u89e3\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u548c\u7ed3\u5408\u6027\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u903b\u8f91\u8fd0\u7b97\u7b26\uff08\u5982`==`\uff09\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e\u8d4b\u503c\u8fd0\u7b97\u7b26\uff08\u5982`=`\uff09\u3002\u5f53\u9047\u5230\u590d\u6742\u8868\u8fbe\u5f0f\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u62ec\u53f7\u6765\u660e\u786e\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\uff0c\u4ece\u800c\u786e\u4fdd\u8868\u8fbe\u5f0f\u6309\u9884\u671f\u7684\u65b9\u5f0f\u6267\u884c\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"\u5728C \u8bed\u8a00\u4e2d\uff0c`x = 5 == 4` \u8868\u793a\u5c06\u903b\u8f91\u8868\u8fbe\u5f0f`5 == 4` \u7684\u7ed3\u679c\uff08\u5373`false` \u6216`0`\uff09 [&hellip;]","protected":false},"author":3,"featured_media":63146,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[1796,277],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/63142"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=63142"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/63142\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/63146"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=63142"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=63142"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=63142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}