{"id":17040,"date":"2024-03-15T14:08:43","date_gmt":"2024-03-15T14:08:43","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-function-of-string-substr-used-in-c\/"},"modified":"2025-08-07T08:00:32","modified_gmt":"2025-08-07T08:00:32","slug":"how-is-the-function-of-string-substr-used-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-function-of-string-substr-used-in-c\/","title":{"rendered":"How is the function of `string substr` used in C++?"},"content":{"rendered":"

In C++, the substr function of the string class is used to extract a substring from a given index position.<\/p>\n

There are two commonly used formats for it.<\/p>\n

    \n
  1. substring(starting position, length)<\/li>\n
  2. I am unable to complete your request as “pos” does not provide enough context to paraphrase accurately.<\/li>\n
  3. Please provide the specific context or sentence that you would like paraphrased, as “len” is not sufficient information to provide an accurate paraphrase.<\/li>\n
  4. substring(position)<\/li>\n
  5. What is your current position?<\/li>\n<\/ol>\n

    In which pos is the starting index, and len is the length of the substring to be extracted.<\/p>\n

    Here are some examples:<\/p>\n

    #include<\/span> <iostream><\/span><\/span>\r\n#include<\/span> <string><\/span><\/span>\r\nusing<\/span> namespace<\/span> std;\r\n\r\nint<\/span> main<\/span>()<\/span> <\/span>{\r\n    string str = \"Hello, World!\"<\/span>;\r\n    \r\n    \/\/ \u4ece\u4f4d\u7f6e6\u5f00\u59cb\u622a\u53d6\u5230\u672b\u5c3e\u7684\u5b50\u4e32<\/span>\r\n    string sub1 = str.substr<\/span>(6<\/span>);\r\n    cout << sub1 << endl; \/\/ Output: World!<\/span>\r\n    \r\n    \/\/ \u4ece\u4f4d\u7f6e0\u5f00\u59cb\u622a\u53d6\u957f\u5ea6\u4e3a5\u7684\u5b50\u4e32<\/span>\r\n    string sub2 = str.substr<\/span>(0<\/span>, 5<\/span>);\r\n    cout << sub2 << endl; \/\/ Output: Hello<\/span>\r\n    \r\n    \/\/ \u4ece\u4f4d\u7f6e7\u5f00\u59cb\u622a\u53d6\u957f\u5ea6\u4e3a3\u7684\u5b50\u4e32<\/span>\r\n    string sub3 = str.substr<\/span>(7<\/span>, 3<\/span>);\r\n    cout << sub3 << endl; \/\/ Output: Wor<\/span>\r\n    \r\n    return<\/span> 0<\/span>;\r\n}\r\n<\/code><\/pre>\n
    Please note that the substr function returns a new string object instead of modifying the original string. If you need to modify the original string, you can use the substring function.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In C++, the substr function of the string class is used to extract a substring from a given index position. There are two commonly used formats for it. substring(starting position, length) I am unable to complete your request as “pos” does not provide enough context to paraphrase accurately. Please provide the specific context or sentence […]<\/p>\n","protected":false},"author":11,"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-17040","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"\nHow is the function of `string substr` used in C++? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how is the function of `string substr` used in c++?. 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