{"id":10370,"date":"2024-03-14T11:57:50","date_gmt":"2024-03-14T11:57:50","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-strstr-function-used-in-c\/"},"modified":"2025-08-03T22:39:59","modified_gmt":"2025-08-03T22:39:59","slug":"how-is-the-strstr-function-used-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-strstr-function-used-in-c\/","title":{"rendered":"strstr Function in C++: Usage Guide"},"content":{"rendered":"<p>In C++, the strstr function is used to locate the position of a specified substring within a string. Its prototype is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-type\">char<\/span>* <span class=\"hljs-title\">strstr<\/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><\/span>;\r\n<\/code><\/pre>\n<p>The function strstr will return a pointer to the first occurrence of the substring str2 within the string str1, or nullptr if the substring is not found.<\/p>\n<p>Sample code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;cstring&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span>* str1 = <span class=\"hljs-string\">\"Hello, world!\"<\/span>;\r\n    <span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span>* str2 = <span class=\"hljs-string\">\"world\"<\/span>;\r\n\r\n    <span class=\"hljs-type\">char<\/span>* result = <span class=\"hljs-built_in\">strstr<\/span>(str1, str2);\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (result) {\r\n        std::cout &lt;&lt; <span class=\"hljs-string\">\"Found at position: \"<\/span> &lt;&lt; result - str1 &lt;&lt; std::endl;\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        std::cout &lt;&lt; <span class=\"hljs-string\">\"Not found\"<\/span> &lt;&lt; std::endl;\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>The output result is:<\/p>\n<pre class=\"post-pre\"><code>Found at position: 7\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In C++, the strstr function is used to locate the position of a specified substring within a string. Its prototype is as follows: char* strstr(const char* str1, const char* str2); The function strstr will return a pointer to the first occurrence of the substring str2 within the string str1, or nullptr if the substring is [&hellip;]<\/p>\n","protected":false},"author":10,"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":[381,2948,1115,9479,3448],"class_list":["post-10370","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-programming","tag-c-strings","tag-string-functions","tag-strstr","tag-substring-search"],"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>strstr Function in C++: Usage Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to use the strstr function in C++ to find substrings. 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