{"id":38863,"date":"2023-07-18T22:51:09","date_gmt":"2023-07-18T14:51:09","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=38863"},"modified":"2023-07-31T02:18:14","modified_gmt":"2023-07-30T18:18:14","slug":"c-%e4%b8%ad%ef%bc%8cifx8-%e5%92%8cif8x-%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/38863.html","title":{"rendered":"C++ \u4e2d\uff0cif(x==8) \u548cif(8==x) \u6709\u4ec0\u4e48\u533a\u522b"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>C++ \u4e2d\uff0cif(x==8) \u548cif(8==x) \u6709\u4ee5\u4e0b\u533a\u522b\uff1a\u4e00\u3001\u8bed\u6cd5\u7ed3\u6784\u5dee\u5f02\uff1b\u4e8c\u3001\u6f5c\u5728\u9519\u8bef\u68c0\u6d4b\u5dee\u5f02\uff1b\u4e09\u3001\u5b89\u5168\u6027\u5dee\u5f02\u3002\u8bed\u6cd5\u7ed3\u6784\u5dee\u5f02\u662f\u6307\uff0cif(x==8) \u8fd9\u79cd\u5199\u6cd5\u662f\u5e38\u89c1\u7684\u3001\u5e38\u89c4\u7684\u5f62\u5f0f\uff0c\u800cif(8==x)\u8fd9\u79cd\u5199\u6cd5\u88ab\u79f0\u4e3a\u201c\u5012\u7f6e\u5199\u6cd5\u201d\u6216\u201c\u5012\u8f6c\u5199\u6cd5\u201d\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"C++ \u4e2d\uff0cif(x==8) \u548cif(8==x) \u6709\u4ec0\u4e48\u533a\u522b\" class=\"wp-image-38864\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/07\/16-3.jpeg?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/07\/16-3.jpeg?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/07\/16-3-300x186.jpeg 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u8bed\u6cd5\u7ed3\u6784\u5dee\u5f02<\/h2>\n<p>if(x==8)\uff1a\u8fd9\u79cd\u5199\u6cd5\u662f\u5e38\u89c1\u7684\u3001\u5e38\u89c4\u7684\u5f62\u5f0f\uff0c\u5c06\u53d8\u91cfx\u4e0e8\u8fdb\u884c\u6bd4\u8f83\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c06\u9996\u5148\u5bf9\u53d8\u91cfx\u7684\u503c\u8fdb\u884c\u6c42\u503c\uff0c\u7136\u540e\u5c06\u5176\u4e0e8\u8fdb\u884c\u6bd4\u8f83\uff0c\u4ee5\u786e\u5b9a\u6761\u4ef6\u662f\u5426\u4e3a\u771f\u3002<\/p>\n<p>if(8==x)\uff1a\u8fd9\u79cd\u5199\u6cd5\u88ab\u79f0\u4e3a\u201c\u5012\u7f6e\u5199\u6cd5\u201d\u6216\u201c\u5012\u8f6c\u5199\u6cd5\u201d\uff0c\u5c06\u5e38\u91cf8\u4e0e\u53d8\u91cfx\u8fdb\u884c\u6bd4\u8f83\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u9996\u5148\u5c06\u5e38\u91cf8\u4e0e\u53d8\u91cfx\u8fdb\u884c\u6bd4\u8f83\uff0c\u7136\u540e\u786e\u5b9a\u6761\u4ef6\u662f\u5426\u4e3a\u771f\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u6f5c\u5728\u9519\u8bef\u68c0\u6d4b\u5dee\u5f02<\/h2>\n<p>if(x==8)\uff1a\u8fd9\u79cd\u5199\u6cd5\u5728\u8bed\u6cd5\u4e0a\u662f\u5b8c\u5168\u6b63\u786e\u7684\uff0c\u4f46\u5728\u7f16\u7801\u65f6\u5bb9\u6613\u72af\u4e00\u4e9b\u9519\u8bef\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e0d\u5c0f\u5fc3\u5c06\u201c==\u201d\u5199\u6210\u201c=\u201d\uff08\u8d4b\u503c\u8fd0\u7b97\u7b26\uff09\uff0c\u5219\u6761\u4ef6\u8bed\u53e5\u5c06\u53d8\u4e3a\u8d4b\u503c\u8bed\u53e5\uff0c\u53ef\u80fd\u5bfc\u81f4\u9519\u8bef\u7684\u7ed3\u679c\u3002\u8fd9\u79cd\u9519\u8bef\u53ef\u4ee5\u5f88\u96be\u88ab\u53d1\u73b0\u5e76\u4fee\u590d\uff0c\u56e0\u4e3a\u8d4b\u503c\u64cd\u4f5c\u4e0d\u4f1a\u5f15\u53d1\u7f16\u8bd1\u5668\u9519\u8bef\u6216\u8b66\u544a\u3002<\/p>\n<p>if(8==x)\uff1a\u8fd9\u79cd\u5199\u6cd5\u5728\u8bed\u6cd5\u4e0a\u662f\u5b8c\u5168\u6b63\u786e\u7684\uff0c\u5e76\u4e14\u5177\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u4f18\u52bf\uff0c\u5373\u53ef\u4ee5\u5e2e\u52a9\u68c0\u6d4b\u5e38\u89c1\u7684\u7f16\u7801\u9519\u8bef\u3002\u5982\u679c\u4e0d\u5c0f\u5fc3\u5c06\u201c==\u201d\u5199\u6210\u201c=\u201d\uff08\u8d4b\u503c\u8fd0\u7b97\u7b26\uff09\uff0c\u5219\u7f16\u8bd1\u5668\u5c06\u4f1a\u4ea7\u751f\u4e00\u4e2a\u9519\u8bef\uff0c\u56e0\u4e3a\u5e38\u91cf8\u4e0d\u80fd\u88ab\u8d4b\u503c\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5b89\u5168\u6027\u5dee\u5f02<\/h2>\n<p>if(x==8)\uff1a\u8fd9\u79cd\u5199\u6cd5\u5728\u5b89\u5168\u6027\u65b9\u9762\u6ca1\u6709\u660e\u663e\u7684\u4f18\u52bf\u6216\u52a3\u52bf\u3002\u53ea\u8981\u64cd\u4f5c\u6570\u7684\u7c7b\u578b\u662f\u76f8\u5bb9\u7684\uff0c\u5e76\u4e14\u6ca1\u6709\u5176\u4ed6\u6f5c\u5728\u7684\u903b\u8f91\u9519\u8bef\uff0c\u8fd9\u79cd\u5199\u6cd5\u662f\u5b89\u5168\u7684\u3002<\/p>\n<p>if(8==x)\uff1a\u8fd9\u79cd\u5199\u6cd5\u5728\u5b89\u5168\u6027\u65b9\u9762\u5177\u6709\u4e00\u5b9a\u7684\u4f18\u52bf\u3002\u5982\u679c\u4e0d\u5c0f\u5fc3\u5c06\u201c==\u201d\u5199\u6210\u201c=\u201d\uff0c\u7f16\u8bd1\u5668\u5c06\u4f1a\u4ea7\u751f\u4e00\u4e2a\u9519\u8bef\uff0c\u4ece\u800c\u9632\u6b62\u53ef\u80fd\u5bfc\u81f4\u9519\u8bef\u7ed3\u679c\u7684\u6f5c\u5728\u95ee\u9898\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0cif(x==8)\u548cif(8==x)\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u5199\u6cd5\u7684\u987a\u5e8f\u548c\u5bf9\u6f5c\u5728\u9519\u8bef\u7684\u68c0\u6d4b\u80fd\u529b\u3002\u5012\u7f6e\u5199\u6cd5if(8==x)\u53ef\u4ee5\u5e2e\u52a9\u68c0\u6d4b\u5e38\u89c1\u7684\u7f16\u7801\u9519\u8bef\uff0c\u7279\u522b\u662f\u5c06\u201c==\u201d\u8bef\u5199\u4e3a\u201c=\u201d\u7684\u60c5\u51b5\u3002\u56e0\u6b64\uff0c\u4f7f\u7528if(8==x)\u7684\u5199\u6cd5\u53ef\u4ee5\u589e\u52a0\u4ee3\u7801\u7684\u5b89\u5168\u6027\uff0c\u51cf\u5c11\u6f5c\u5728\u7684\u9519\u8bef\u53d1\u751f\u3002\u7136\u800c\uff0c\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u4e24\u79cd\u5199\u6cd5\u90fd\u662f\u5408\u6cd5\u7684\uff0c\u9009\u62e9\u54ea\u79cd\u5199\u6cd5\u5e94\u6839\u636e\u4e2a\u4eba\u504f\u597d\u548c\u4ee3\u7801\u89c4\u8303\u6765\u51b3\u5b9a\u3002<\/p>\n<p><strong><em>\u5ef6\u4f38\u9605\u8bfb1\uff1ac\u8bed\u8a00if\u8868\u8fbe\u5f0f\u53ef\u4ee5\u662f\u4efb\u610f\u8868\u8fbe\u5f0f\u5417<\/em><\/strong><\/p>\n<p>\u5728C\u8bed\u8a00\u4e2d\uff0cif\u8bed\u53e5\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\u53ef\u4ee5\u662f\u4efb\u610f\u7684\u8868\u8fbe\u5f0f\uff0c\u800c\u4e0d\u4ec5\u9650\u4e8e\u7b80\u5355\u7684\u6bd4\u8f83\u8868\u8fbe\u5f0f\u3002\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u5e94\u8be5\u662f\u4e00\u4e2a\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff08true\u6216false\uff09\u7684\u503c\u3002<\/p>\n<p>\u5728if\u8bed\u53e5\u4e2d\uff0c\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u503c\u4e3atrue\u65f6\uff0c\u6267\u884cif\u4ee3\u7801\u5757\u4e2d\u7684\u8bed\u53e5\uff1b\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u503c\u4e3afalse\u65f6\uff0c\u8df3\u8fc7if\u4ee3\u7801\u5757\uff0c\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u7684\u8bed\u53e5\u3002<\/p>\n<p>\u6761\u4ef6\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5305\u542b\u4ee5\u4e0b\u7c7b\u578b\u7684\u8868\u8fbe\u5f0f\uff1a<\/p>\n<ul>\n<li>\u6bd4\u8f83\u8868\u8fbe\u5f0f\uff1a\u4f8b\u5982x &gt; 5\u3001y == 10\u7b49\u3002\u6bd4\u8f83\u8868\u8fbe\u5f0f\u6839\u636e\u5173\u7cfb\u8fd0\u7b97\u7b26\uff08\u5982\u5927\u4e8e\u3001\u5c0f\u4e8e\u3001\u7b49\u4e8e\u7b49\uff09\u5bf9\u64cd\u4f5c\u6570\u8fdb\u884c\u6bd4\u8f83\uff0c\u5e76\u8fd4\u56detrue\u6216false\u3002<\/li>\n<li>\u903b\u8f91\u8868\u8fbe\u5f0f\uff1a\u4f8b\u5982x &gt; 5 &amp;&amp; y &lt; 10\u7b49\u3002\u903b\u8f91\u8868\u8fbe\u5f0f\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\uff08\u5982\u4e0e&amp;&amp;\u3001\u6216||\u3001\u975e!\u7b49\uff09\u5bf9\u591a\u4e2a\u6761\u4ef6\u8fdb\u884c\u7ec4\u5408\uff0c\u5e76\u8fd4\u56detrue\u6216false\u3002<\/li>\n<li>\u4e09\u5143\u8868\u8fbe\u5f0f\uff1a\u4f8b\u5982x &gt; 5 ? true : false\u3002\u4e09\u5143\u8868\u8fbe\u5f0f\u6839\u636e\u6761\u4ef6\u7684\u771f\u5047\u8fd4\u56de\u4e24\u4e2a\u53ef\u80fd\u7684\u7ed3\u679c\u4e4b\u4e00\u3002<\/li>\n<li>\u51fd\u6570\u8c03\u7528\uff1a\u4f8b\u5982isPositive(x)\u3002\u51fd\u6570\u8c03\u7528\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u7684\u7ed3\u679c\u3002<\/li>\n<li>\u53d8\u91cf\u6216\u5e38\u91cf\uff1a\u4f8b\u5982flag\u30010\u7b49\u3002\u53d8\u91cf\u6216\u5e38\u91cf\u53ef\u4ee5\u76f4\u63a5\u7528\u4f5c\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u5176\u975e\u96f6\u503c\u88ab\u89c6\u4e3atrue\uff0c\u96f6\u503c\u88ab\u89c6\u4e3afalse\u3002<\/li>\n<\/ul>\n<p>\u603b\u4e4b\uff0cC\u8bed\u8a00\u4e2d\u7684if\u8bed\u53e5\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\u53ef\u4ee5\u662f\u4efb\u610f\u5408\u6cd5\u7684\u8868\u8fbe\u5f0f\uff0c\u53ea\u8981\u5176\u7ed3\u679c\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002\u8fd9\u4f7f\u5f97\u7a0b\u5e8f\u5458\u80fd\u591f\u6839\u636e\u9700\u8981\u4f7f\u7528\u590d\u6742\u7684\u6761\u4ef6\u903b\u8f91\u6765\u63a7\u5236\u7a0b\u5e8f\u7684\u6d41\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"C++ \u4e2d\uff0cif(x==8) \u548cif(8==x) \u6709\u4ee5\u4e0b\u533a\u522b\uff1a\u4e00\u3001\u8bed\u6cd5\u7ed3\u6784\u5dee\u5f02\uff1b\u4e8c\u3001\u6f5c\u5728\u9519\u8bef\u68c0\u6d4b\u5dee\u5f02\uff1b\u4e09\u3001\u5b89\u5168 [&hellip;]","protected":false},"author":1,"featured_media":38864,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/38863"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=38863"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/38863\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/38864"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=38863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=38863"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=38863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}