{"id":3259,"date":"2025-03-28T00:06:31","date_gmt":"2025-03-27T16:06:31","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3259"},"modified":"2025-03-28T00:06:31","modified_gmt":"2025-03-27T16:06:31","slug":"c-%e5%88%a4%e6%96%ad%e8%af%ad%e5%8f%a5%ef%bc%88conditional-statements-in-c","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/28\/c-%e5%88%a4%e6%96%ad%e8%af%ad%e5%8f%a5%ef%bc%88conditional-statements-in-c\/","title":{"rendered":"C++ \u5224\u65ad\u8bed\u53e5\uff08Conditional Statements in C++)"},"content":{"rendered":"\n<p>\u5728 C++ \u4e2d\uff0c\u5224\u65ad\u8bed\u53e5\u7528\u4e8e\u6839\u636e\u4e0d\u540c\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002\u5e38\u89c1\u7684\u5224\u65ad\u8bed\u53e5\u6709 <strong><code>if<\/code><\/strong> \u8bed\u53e5\u3001<strong><code>if-else<\/code><\/strong> \u8bed\u53e5\u3001<strong><code>else-if<\/code><\/strong> \u8bed\u53e5\u4ee5\u53ca <strong><code>switch<\/code><\/strong> \u8bed\u53e5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. if \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>if<\/code> \u8bed\u53e5\u7528\u4e8e\u5224\u65ad\u6761\u4ef6\u662f\u5426\u4e3a\u771f\uff0c\u5982\u679c\u6761\u4ef6\u4e3a\u771f\uff0c\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if (condition) {\n    \/\/ \u5982\u679c\u6761\u4ef6\u4e3a\u771f\u6267\u884c\u7684\u4ee3\u7801\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 if \u8bed\u53e5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int a = 10;\n    if (a &gt; 5) {\n        cout &lt;&lt; \"a \u5927\u4e8e 5\" &lt;&lt; endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a \u5927\u4e8e 5<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. if-else \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>if-else<\/code> \u8bed\u53e5\u7528\u4e8e\u5728\u6761\u4ef6\u4e3a\u771f\u65f6\u6267\u884c\u4e00\u90e8\u5206\u4ee3\u7801\uff0c\u5728\u6761\u4ef6\u4e3a\u5047\u65f6\u6267\u884c\u53e6\u4e00\u90e8\u5206\u4ee3\u7801\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if (condition) {\n    \/\/ \u5982\u679c\u6761\u4ef6\u4e3a\u771f\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ \u5982\u679c\u6761\u4ef6\u4e3a\u5047\u6267\u884c\u7684\u4ee3\u7801\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 if-else \u8bed\u53e5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int a = 3;\n    if (a &gt; 5) {\n        cout &lt;&lt; \"a \u5927\u4e8e 5\" &lt;&lt; endl;\n    } else {\n        cout &lt;&lt; \"a \u5c0f\u4e8e\u6216\u7b49\u4e8e 5\" &lt;&lt; endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a \u5c0f\u4e8e\u6216\u7b49\u4e8e 5<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. if-else if-else \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p>\u5f53\u6709\u591a\u4e2a\u6761\u4ef6\u9700\u8981\u5224\u65ad\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>if-else if-else<\/code> \u8bed\u53e5\u3002\u5728\u591a\u4e2a\u6761\u4ef6\u4e2d\u5224\u65ad\uff0c\u76f4\u5230\u9047\u5230\u7b2c\u4e00\u4e2a\u4e3a\u771f\u7684\u6761\u4ef6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if (condition1) {\n    \/\/ \u5982\u679c\u6761\u4ef61\u4e3a\u771f\u6267\u884c\u7684\u4ee3\u7801\n} else if (condition2) {\n    \/\/ \u5982\u679c\u6761\u4ef62\u4e3a\u771f\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ \u5982\u679c\u6ca1\u6709\u6761\u4ef6\u4e3a\u771f\u6267\u884c\u7684\u4ee3\u7801\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 if-else if-else \u8bed\u53e5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int a = 10;\n    if (a &gt; 15) {\n        cout &lt;&lt; \"a \u5927\u4e8e 15\" &lt;&lt; endl;\n    } else if (a &gt; 5) {\n        cout &lt;&lt; \"a \u5927\u4e8e 5 \u4f46\u5c0f\u4e8e\u7b49\u4e8e 15\" &lt;&lt; endl;\n    } else {\n        cout &lt;&lt; \"a \u5c0f\u4e8e\u6216\u7b49\u4e8e 5\" &lt;&lt; endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a \u5927\u4e8e 5 \u4f46\u5c0f\u4e8e\u7b49\u4e8e 15<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. switch \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>switch<\/code> \u8bed\u53e5\u7528\u4e8e\u5904\u7406\u591a\u4e2a\u6761\u4ef6\u5224\u65ad\uff0c\u9002\u5408\u7528\u4e8e\u57fa\u4e8e\u67d0\u4e2a\u53d8\u91cf\u503c\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002<code>switch<\/code> \u6bd4\u591a\u4e2a <code>if-else<\/code> \u66f4\u9ad8\u6548\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>switch (variable) {\n    case value1:\n        \/\/ \u5f53 variable == value1 \u65f6\u6267\u884c\u7684\u4ee3\u7801\n        break;\n    case value2:\n        \/\/ \u5f53 variable == value2 \u65f6\u6267\u884c\u7684\u4ee3\u7801\n        break;\n    \/\/ \u53ef\u4ee5\u6709\u591a\u4e2a case \u5206\u652f\n    default:\n        \/\/ \u5982\u679c\u6ca1\u6709\u4efb\u4f55 case \u5339\u914d\u65f6\u6267\u884c\u7684\u4ee3\u7801\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 switch \u8bed\u53e5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int day = 3;\n    switch (day) {\n        case 1:\n            cout &lt;&lt; \"\u661f\u671f\u4e00\" &lt;&lt; endl;\n            break;\n        case 2:\n            cout &lt;&lt; \"\u661f\u671f\u4e8c\" &lt;&lt; endl;\n            break;\n        case 3:\n            cout &lt;&lt; \"\u661f\u671f\u4e09\" &lt;&lt; endl;\n            break;\n        case 4:\n            cout &lt;&lt; \"\u661f\u671f\u56db\" &lt;&lt; endl;\n            break;\n        default:\n            cout &lt;&lt; \"\u65e0\u6548\u7684\u65e5\u671f\" &lt;&lt; endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u661f\u671f\u4e09<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. \u5d4c\u5957\u5224\u65ad\u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p>\u5728 <code>if-else<\/code> \u6216 <code>switch<\/code> \u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5d4c\u5957\u7684\u5224\u65ad\u8bed\u53e5\uff0c\u5373\u5728\u4e00\u4e2a\u5224\u65ad\u8bed\u53e5\u4e2d\u518d\u5305\u542b\u5176\u4ed6\u5224\u65ad\u8bed\u53e5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b\uff1a\u5d4c\u5957 if \u8bed\u53e5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int a = 10, b = 5;\n    if (a &gt; 5) {\n        if (b &gt; 3) {\n            cout &lt;&lt; \"a \u5927\u4e8e 5\uff0cb \u5927\u4e8e 3\" &lt;&lt; endl;\n        }\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a \u5927\u4e8e 5\uff0cb \u5927\u4e8e 3<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u603b\u7ed3<\/strong><\/h2>\n\n\n\n<p>\u5728 C++ \u4e2d\uff0c\u5224\u65ad\u8bed\u53e5\u7528\u4e8e\u6839\u636e\u7ed9\u5b9a\u7684\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002\u5e38\u89c1\u7684\u5224\u65ad\u8bed\u53e5\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>if<\/code>\uff1a\u5224\u65ad\u6761\u4ef6\u662f\u5426\u4e3a\u771f\uff0c\u6761\u4ef6\u4e3a\u771f\u65f6\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002<\/li>\n\n\n\n<li><code>if-else<\/code>\uff1a\u6761\u4ef6\u4e3a\u771f\u65f6\u6267\u884c\u4e00\u4e2a\u4ee3\u7801\u5757\uff0c\u6761\u4ef6\u4e3a\u5047\u65f6\u6267\u884c\u53e6\u4e00\u4e2a\u4ee3\u7801\u5757\u3002<\/li>\n\n\n\n<li><code>else if<\/code>\uff1a\u591a\u4e2a\u6761\u4ef6\u7684\u5224\u65ad\uff0c\u76f4\u5230\u9047\u5230\u4e3a\u771f\u7684\u6761\u4ef6\u3002<\/li>\n\n\n\n<li><code>switch<\/code>\uff1a\u6839\u636e\u53d8\u91cf\u503c\u7684\u4e0d\u540c\uff0c\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\uff0c\u9002\u5408\u591a\u4e2a\u56fa\u5b9a\u503c\u5224\u65ad\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u638c\u63e1\u8fd9\u4e9b\u5224\u65ad\u8bed\u53e5\u7684\u4f7f\u7528\u53ef\u4ee5\u4f7f\u5f97 C++ \u7a0b\u5e8f\u5728\u5904\u7406\u4e0d\u540c\u60c5\u51b5\u65f6\u53d8\u5f97\u7075\u6d3b\u9ad8\u6548\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 C++ \u4e2d\uff0c\u5224\u65ad\u8bed\u53e5\u7528\u4e8e\u6839\u636e\u4e0d\u540c\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002\u5e38\u89c1\u7684\u5224\u65ad\u8bed\u53e5\u6709 if \u8bed\u53e5\u3001if-else \u8bed\u53e5\u3001 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3260,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"class_list":["post-3259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3259"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3259\/revisions"}],"predecessor-version":[{"id":3261,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3259\/revisions\/3261"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3260"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}