标签:desc param ber ica mes har detail use obj
string substr (size_t pos = 0, size_t len = npos) const;
Returns a newly constructed string object with its value initialized to a copy of a substring of this object.
The substring is the portion of the object that starts at character position pos and spans len characters (or until the end of the string, whichever comes first).
A string object with a substring of this object.
// string::substr #include <iostream> #include <string> int main () { std::string str="We think in generalities, but we live in details."; // (quoting Alfred N. Whitehead) std::string str2 = str.substr (3,5); // "think" std::size_t pos = str.find("live"); // position of "live" in str std::string str3 = str.substr (pos); // get from "live" to the end std::cout << str2 << ‘ ‘ << str3 << ‘\n‘; return 0; }
//output:think live in details.
#include<string> #include<iostream> using namespace std; int main() { string s("12345asdf"); string a = s.substr(0,5); //获得字符串s中从第0位开始的长度为5的字符串 cout << a << endl; } //output:12345
参考:http://www.cplusplus.com/reference/string/string/substr/
标签:desc param ber ica mes har detail use obj
原文地址:https://www.cnblogs.com/jianqiao123/p/12229510.html