{"id":17024,"date":"2024-03-15T14:06:27","date_gmt":"2024-03-15T14:06:27","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-purpose-of-the-string-substr-function-in-c\/"},"modified":"2025-08-07T07:52:29","modified_gmt":"2025-08-07T07:52:29","slug":"what-is-the-purpose-of-the-string-substr-function-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-purpose-of-the-string-substr-function-in-c\/","title":{"rendered":"What is the purpose of the string substr function in C+&#8230;"},"content":{"rendered":"<p>The function string.substr() in C++ is used to extract a substring from a string. It takes two parameters: the starting position and the length of the substring. This function will return a new string containing the extracted substring from the original string.<\/p>\n<p>Here is the syntax for the string.substr() function:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\">string <span class=\"hljs-title\">substr<\/span> <span class=\"hljs-params\">(<span class=\"hljs-type\">size_t<\/span> pos, <span class=\"hljs-type\">size_t<\/span> len)<\/span> <span class=\"hljs-type\">const<\/span><\/span>;\r\n<\/code><\/pre>\n<ol>\n<li>pos: Starting position for extracting a substring. If pos exceeds the length of the string, the function will return an empty string.<\/li>\n<li>len: the length of the extracted sub-string. If not specified, the string will be extracted from the starting position to the end.<\/li>\n<\/ol>\n<p>Here is an example of using the string.substr() function:<\/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;string&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    std::string str = <span class=\"hljs-string\">\"Hello, World!\"<\/span>;\r\n    std::string sub = str.<span class=\"hljs-built_in\">substr<\/span>(<span class=\"hljs-number\">7<\/span>, <span class=\"hljs-number\">5<\/span>);\r\n    std::cout &lt;&lt; sub &lt;&lt; std::endl;  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa \"World\"<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the example above, str.substr(7, 5) extracts a substring of length 5 starting from index 7, which means it grabs 5 characters starting from position 7, resulting in &#8220;World&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The function string.substr() in C++ is used to extract a substring from a string. It takes two parameters: the starting position and the length of the substring. This function will return a new string containing the extracted substring from the original string. Here is the syntax for the string.substr() function: string substr (size_t pos, size_t [&hellip;]<\/p>\n","protected":false},"author":13,"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":[453,1402,299,1404,1403],"class_list":["post-17024","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"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>What is the purpose of the string substr function in C+... - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about what is the purpose of the string substr function in c++?. 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