许愿

1. #include <iostream>#include <string>using namespace std;int main(int argc, char const *argv[]){ string line; getline(cin,line); for(auto &c:line) c='X'; cout<<line; cout<

1. string中npos , find , substr ,c_str的使用。#include<iostream>#include<string>#include<cstdlib>using namespace std;//找到字符串中，字符":"后面的数字并输出 void find_number(string &s){ int pos=s.find(":"); //st