{"id":9004,"date":"2023-02-11T16:18:01","date_gmt":"2023-02-11T08:18:01","guid":{"rendered":"https:\/\/blog.iyatt.com\/?p=9004"},"modified":"2024-05-05T14:18:24","modified_gmt":"2024-05-05T06:18:24","slug":"c-c-%e8%87%aa%e5%a2%9e%e8%87%aa%e5%87%8f%e7%9a%84%e6%9c%aa%e5%ae%9a%e4%b9%89%e8%a1%8c%e4%b8%ba","status":"publish","type":"post","link":"https:\/\/blog.iyatt.com\/?p=9004","title":{"rendered":"C\/C++ \u81ea\u589e\u81ea\u51cf\u7684\u672a\u5b9a\u4e49\u884c\u4e3a"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.iyatt.com\/?p=9004\/#%E7%8E%AF%E5%A2%83\" >\u73af\u5883<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.iyatt.com\/?p=9004\/#C_%E8%AF%AD%E8%A8%80\" >C \u8bed\u8a00<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.iyatt.com\/?p=9004\/#C\" >C++<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%E7%8E%AF%E5%A2%83\"><\/span>\u73af\u5883<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u2460<br \/>\nDebian 11 \uff08arm64)<br \/>\n\u7f16\u8bd1\uff1a<\/p>\n<ul>\n<li>C \u8bed\u8a00\uff1a\u7f16\u8bd1\u5668 gcc 10.2.1\uff1b\u7f16\u8bd1\u6807\u51c6 C17\uff1b\u53c2\u6570\uff1a-std=c17 -no-pie -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Werror=format-security -Wextra -pedantic -Wimplicit-fallthrough -Wsequence-point -Wswitch-unreachable -Wswitch-enum -Wstringop-truncation -Wbool-compare -Wtautological-compare -Wfloat-equal -Wshadow=global -Wpointer-arith -Wpointer-compare -Wcast-align -Wcast-qual -Wwrite-strings -Wdangling-else -Wlogical-op -Wconversion -g -O0<\/li>\n<li>C++\uff1a\u7f16\u8bd1\u5668 g++ 10.2.1\uff1b\u7f16\u8bd1\u6807\u51c6 C++20\uff1b\u53c2\u6570\uff1a-std=c++20 -no-pie -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Werror=format-security -Wextra -pedantic -Wimplicit-fallthrough -Wsequence-point -Wswitch-unreachable -Wswitch-enum -Wstringop-truncation -Wbool-compare -Wtautological-compare -Wfloat-equal -Wshadow=global -Wpointer-arith -Wpointer-compare -Wcast-align -Wcast-qual -Wwrite-strings -Wdangling-else -Wlogical-op -Wconversion -g -O0<\/li>\n<\/ul>\n<p>\u2461<br \/>\nWindows 11 \u4e13\u4e1a\u5de5\u4f5c\u7ad9\u7248 22H2<br \/>\n\u5e73\u53f0\u5de5\u5177\u96c6\uff1aVisual Studio 2022 v143<br \/>\n\u7f16\u8bd1\u6807\u51c6 C17\/C++20<br \/>\n\u8b66\u544a\u7b49\u7ea7\uff1a\u542f\u7528\u6240\u6709\u8b66\u544a<\/p>\n<p>\u6ce8\uff1a\u4e0b\u9762\u4f8b\u5b50\u4e2d\uff0c\u7b26\u5408 C\/C++ \u6807\u51c6\u7684\u91c7\u7528 \u2460 \u7f16\u8bd1\u8fd0\u884c\uff0c\u6807\u51c6\u672a\u89c4\u5b9a\u7684\u884c\u4e3a\uff08\u79f0\u4e3a UB\uff0c\u4e0b\u540c\uff09\uff0c\u5c06\u540c\u65f6\u4f7f\u7528 \u2460 \u548c \u2461 \u7f16\u8bd1\u8fd0\u884c<\/p>\n<h2><span class=\"ez-toc-section\" id=\"C_%E8%AF%AD%E8%A8%80\"><\/span>C \u8bed\u8a00<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<pre><code class=\"language-c\">#include &lt;stdio.h&gt;\n\nint main()\n{\n    int a = 10;\n    int b = ++a;\n    printf(&quot;a=%d\uff0cb=%d\\n&quot;, a, b);\n    int c = a++;\n    printf(&quot;a=%d\uff0cc=%d\\n&quot;, a, c);\n    int d = --a;\n    printf(&quot;a=%d\uff0cd=%d\\n&quot;, a, d);\n    int e = a--;\n    printf(&quot;a=%d\uff0ce=%d\\n&quot;, a, e);\n\n    return 0;\n}<\/code><\/pre>\n<p><img decoding=\"async\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2023\/02\/image-1676100825941.png\" alt=\"file\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 93px; --smush-placeholder-aspect-ratio: 93\/75;\" \/><\/p>\n<p>\u4e0a\u9762\u5bf9\u81ea\u589e\u81ea\u51cf\u7684\u4f7f\u7528\u662f\u7b26\u5408\u89c4\u8303\u7684\u4f7f\u7528\uff0c\u64cd\u4f5c\u7b26\u5728\u524d\uff0c\u8d4b\u7ed9\u53d8\u91cf\u7684\u503c\u5c31\u662f\u81ea\u589e\u6216\u81ea\u51cf\u540e\u7684\uff0c\u64cd\u4f5c\u7b26\u5728\u540e\u5c31\u662f\u8d4b\u81ea\u589e\u6216\u81ea\u51cf\u524d\u7684\u503c<\/p>\n<p>\u800c\u4e0b\u9762\u7684\u60c5\u51b5\u5c31\u662f UB \u884c\u4e3a\uff0c\u81f3\u5c11\u5728\u6211\u8fd9\u91cc\u6d4b\u8bd5\u7684 C17 \u548c C++20 \u4e2d\u90fd\u6ca1\u6709\u89c4\u5b9a<\/p>\n<pre><code class=\"language-c\">#include &lt;stdio.h&gt;\n\nint main()\n{\n    int a = 10;\n    int b = (++a) + (++a);\n    printf(&quot;a=%d\uff0cb=%d\\n&quot;, a, b);\n\n    a = 10;\n    int c = (a++) + (a++);\n    printf(&quot;a=%d\uff0cc=%d\\n&quot;, a, c);\n\n    a = 10;\n    int d = (++a) + (a++);\n    printf(&quot;a=%d\uff0cd=%d\\n&quot;, a, d);\n\n    a = 10;\n    int e = (--a) + (--a);\n    printf(&quot;a=%d\uff0ce=%d\\n&quot;, a, e);\n\n    a = 10;\n    int f = (a--) + (a--);\n    printf(&quot;a=%d\uff0cf=%d\\n&quot;, a, f);\n\n    a = 10;\n    int g = (--a) + (a--);\n    printf(&quot;a=%d\uff0cg=%d\\n&quot;, a, g);\n\n    a = 10;\n    printf(&quot;a=%d\uff0c++a=%d\uff0ca++=%d\\n&quot;, a, ++a, a++);\n\n    a = 10;\n    printf(&quot;a=%d\uff0c++a=%d\uff0c++a=%d\\n&quot;, a, ++a, ++a);\n\n    a = 10;\n    printf(&quot;a=%d\uff0ca++=%d\uff0ca++=%d\\n&quot;, a, a++, a++);\n\n    a = 10;\n    printf(&quot;a=%d\uff0c--a=%d\uff0ca----=%d\\n&quot;, a, --a, a--);\n\n    a = 10;\n    printf(&quot;a=%d\uff0c--a=%d\uff0c--a--=%d\\n&quot;, a, --a, --a);\n\n    a = 10;\n    printf(&quot;a=%d\uff0ca--=%d\uff0ca--=%d\\n&quot;, a, a--, a--);\n}<\/code><\/pre>\n<p>\u73af\u5883 \u2460 \u7f16\u8bd1<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2023\/02\/image-1676103262934.png\" alt=\"file\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 530px; --smush-placeholder-aspect-ratio: 530\/673;\" \/><\/p>\n<p>\u5728 -Werror=sequence-point \u53c2\u6570\u4e0b\u5c31\u68c0\u6d4b\u5230\u4e86 UB<br \/>\n\u5728\u540c\u4e00\u4e2a\u8bed\u53e5\u4e2d\uff0c\u5bf9\u540c\u4e00\u4e2a\u53d8\u91cf\uff0c\u591a\u6b21\u81ea\u589e\/\u81ea\u51cf\u64cd\u4f5c\uff0c\u5b83\u7684\u503c\u662f\u4e0d\u786e\u5b9a\u7684\u3002\u6bd4\u5982 (++a) + (++a)\uff0c\u7b2c\u4e00\u4e2a ++a \u7684\u503c\u786e\u5b9e\u662f\u539f\u6765\u7684 a \u7684\u503c\u518d\u52a0\u4e00\uff0c\u90a3\u4e48\u540e\u9762\u90a3\u4e2a\u8868\u8fbe\u5f0f\u518d\u6b21\u6267\u884c ++a \u65f6\uff0c\u7a76\u7adf\u662f\u5728\u539f\u6765\u7684 a \u4e0a\u52a0\u4e00\uff0c\u8fd8\u662f\u5728\u52a0\u4e00\u540e\u7684\u503c\u4e0a\u52a0\u4e00\uff0cC \u8bed\u8a00\u6807\u51c6\u4e2d\u5e76\u6ca1\u6709\u89c4\u5b9a\u3002\u540e\u9762\u5728 printf \u4e2d\u7684\u64cd\u4f5c\uff0c\u4e5f\u662f\u8fd9\u4e2a\u9053\u7406\u3002<br \/>\n\u5728\u5f00\u53d1\u4e2d\u5c31\u8981\u907f\u514d\u8fd9\u6837\u4f7f\u7528\uff0c\u6807\u51c6\u6ca1\u6709\u89c4\u5b9a\u884c\u4e3a\uff0c\u5b83\u7684\u7ed3\u679c\u5c31\u662f\u770b\u7f16\u8bd1\u5668\u600e\u4e48\u505a\uff0c\u8fd9\u6837\u5199\u51fa\u6765\u7684\u7a0b\u5e8f\u5c31\u5177\u6709\u4e0d\u786e\u5b9a\u6027\u3002\u4f60\u81ea\u5df1\u5199\u7684\u65f6\u5019\u7f16\u8bd1\u8fd0\u884c\u7b26\u5408\u81ea\u5df1\u7684\u8981\u6c42\uff0c\u4f46\u662f\u628a\u6e90\u7801\u7ed9\u522b\u4eba\u7f16\u8bd1\u8fd0\u884c\u65f6\uff0c\u7528\u7684\u7f16\u8bd1\u5668\u4e0d\u540c\u7ed3\u679c\u5c31\u53ef\u80fd\u4f1a\u6539\u53d8\u3002\u4e0b\u9762\u5c31\u505a\u4e2a\u5bf9\u6bd4<\/p>\n<p>\u73b0\u5728\u8fd8\u662f\u6309\u7167\u73af\u5883 \u2460 \u7f16\u8bd1\uff0c\u4f46\u662f\u5ffd\u7565\u8fd9\u79cd\u9519\u8bef\u68c0\u67e5<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2023\/02\/image-1676103309233.png\" alt=\"file\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 332px; --smush-placeholder-aspect-ratio: 332\/269;\" \/><\/p>\n<p>\u73af\u5883 \u2461 \u7f16\u8bd1\u65f6\uff0c\u5373\u4f7f\u8bbe\u7f6e\u542f\u7528\u4e86\u6240\u6709\u8b66\u544a\u90fd\u6ca1\u6307\u51fa\u8fd9\u4e2a<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2023\/02\/image-1676103370078.png\" alt=\"file\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 246px; --smush-placeholder-aspect-ratio: 246\/237;\" \/><\/p>\n<p>\u540c\u6837\u7684\u4ee3\u7801\uff0c\u90e8\u5206\u51fa\u73b0\u4e86\u7ed3\u679c\u4e0d\u540c\u7684\u60c5\u51b5\uff0c\u5373\u4f7f\u76f8\u540c\u7684\u90e8\u5206\uff0c\u518d\u6362\u4e00\u79cd\u7f16\u8bd1\u5668\u8bf4\u4e0d\u5b9a\u53ef\u80fd\u53c8\u4f1a\u4e0d\u540c\uff0c\u5c31\u770b\u7f16\u8bd1\u5668\u600e\u4e48\u505a<\/p>\n<h2><span class=\"ez-toc-section\" id=\"C\"><\/span>C++<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u5728 C++ \u652f\u6301\u7684\u8303\u56f4\u5185\uff0c\u6240\u4ee5\u7ee7\u7eed\u4f7f\u7528\u4e0a\u9762\u7684\u4ee3\u7801\u518d\u5206\u522b\u6309\u7167 C++ \u6765\u7f16\u8bd1<\/p>\n<p>\u73af\u5883 \u2460<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2023\/02\/image-1676104141905.png\" alt=\"file\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 278px; --smush-placeholder-aspect-ratio: 278\/265;\" \/><\/p>\n<p>\u73af\u5883 \u2461<br \/>\n<img decoding=\"async\" data-src=\"https:\/\/blog.iyatt.com\/wp-content\/uploads\/2023\/02\/image-1676104161356.png\" alt=\"file\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 254px; --smush-placeholder-aspect-ratio: 254\/240;\" \/><\/p>\n<p>\u73af\u5883 \u2460 \u7684\u7ed3\u679c\u548c C \u8bed\u8a00\u4e00\u6837\uff0c\u73af\u5883 \u2461 \u7684\u5c31\u6709\u5dee\u522b\u4e86\uff0c\u540c\u4e00\u4e2a\u7f16\u8bd1\u5668\uff0c\u6309\u7167 C \u548c C++ \u5206\u522b\u7f16\u8bd1\u8fd0\u884c\u7684\u7ed3\u679c\u51fa\u73b0\u4e86\u4e0d\u540c\u3002\u5f53\u7136\u4e5f\u4e0d\u80fd\u8981\u6c42\u5b83\u4eec\u4e00\u6837\uff0c\u6bd5\u7adf C \u548c C++ \u662f\u4e24\u95e8\u4e0d\u540c\u7684\u8bed\u8a00\uff0c\u5404\u81ea\u6709\u5404\u81ea\u7684\u6807\u51c6\uff0c\u518d\u8bf4\u8fd9\u4e2a\u662f UB\uff0c\u600e\u4e48\u505a\u662f\u7f16\u8bd1\u5668\u7684\u81ea\u7531\uff0c\u53ea\u662f\u8bf4\u5fae\u8f6f\u7684 MSVC \u5728 C \u548c C++ \u7684\u8fd9\u79cd UB \u5904\u7406\u4e0a\u4f7f\u7528\u4e86\u4e0d\u540c\u7684\u903b\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u73af\u5883 \u2460 Debian 11 \uff08arm64) \u7f16\u8bd1\uff1a C \u8bed\u8a00\uff1a\u7f16\u8bd1\u5668 gcc 10.2.1\uff1b\u7f16\u8bd1\u6807\u51c6 C17 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"zakra_page_container_layout":"customizer","zakra_page_sidebar_layout":"customizer","zakra_remove_content_margin":false,"zakra_sidebar":"customizer","zakra_transparent_header":"customizer","zakra_logo":0,"zakra_main_header_style":"default","zakra_menu_item_color":"","zakra_menu_item_hover_color":"","zakra_menu_item_active_color":"","zakra_menu_active_style":"","zakra_page_header":true,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-9004","post","type-post","status-publish","format-standard","hentry","category-all"],"modified_by":"IYATT-yx","_links":{"self":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/posts\/9004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9004"}],"version-history":[{"count":0,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=\/wp\/v2\/posts\/9004\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.iyatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}