{"id":8065,"date":"2024-03-14T07:30:09","date_gmt":"2024-03-14T07:30:09","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-the-strcmp-function-in-the-c-language\/"},"modified":"2025-08-03T00:12:21","modified_gmt":"2025-08-03T00:12:21","slug":"how-to-use-the-strcmp-function-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-the-strcmp-function-in-the-c-language\/","title":{"rendered":"C strcmp() Guide: Compare Strings"},"content":{"rendered":"<p>The strcmp function is used to compare the size of two strings, and its prototype is:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">strcmp<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span> *str1, <span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span> *str2)<\/span>;\r\n<\/code><\/pre>\n<p>&#8220;\u5176\u4e2d\uff0cstr1 and str2 are the two strings being compared.&#8221;<\/p>\n<p>There are three possible return values for the strcmp function.<\/p>\n<ol>\n<li>Return 0 if str1 is equal to str2.<\/li>\n<li>If str1 is greater than str2, return a positive number.<\/li>\n<li>If str1 is less than str2, return a negative number.<\/li>\n<\/ol>\n<p>Here is an example code using the strcmp function:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;string.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">char<\/span> str1[] = <span class=\"hljs-string\">\"hello\"<\/span>;\r\n    <span class=\"hljs-type\">char<\/span> str2[] = <span class=\"hljs-string\">\"world\"<\/span>;\r\n\r\n    <span class=\"hljs-type\">int<\/span> result = <span class=\"hljs-built_in\">strcmp<\/span>(str1, str2);\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (result == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"str1 and str2 are equal\\n\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (result &gt; <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"str1 is greater than str2\\n\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"str1 is less than str2\\n\"<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In this code snippet, we compared the sizes of two strings &#8220;hello&#8221; and &#8220;world&#8221; and printed the corresponding information based on the comparison result.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The strcmp function is used to compare the size of two strings, and its prototype is: int strcmp(const char *str1, const char *str2); &#8220;\u5176\u4e2d\uff0cstr1 and str2 are the two strings being compared.&#8221; There are three possible return values for the strcmp function. Return 0 if str1 is equal to str2. If str1 is greater than [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[10625,698,381,8516,9564],"class_list":["post-8065","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-string-comparison","tag-c-functions","tag-c-programming","tag-strcmp","tag-string-h"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C strcmp() Guide: Compare Strings - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to compare strings in C with strcmp(). 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