【C++】string和int类型相互转换

#include<iostream>
using namespace std;
#include<string>
#include<typeinfo>
void test() {
  //1. string -> int
  string s = "123";
  int str2i = stoi(s);
  cout << typeid(str2i).name() << endl;
  //2. int -> string
  int i = 456;
  string i2str = to_string(i);
  cout << typeid(i2str).name() << endl;
}
int main() {
  test();
  system("pause");
  return 0;
}

#include <sstream>
void i2s(int num, string& str){
  stringstream ss;
  ss << num;
  ss >> str;
}
void s2i(string str, int& num){
  stringstream ss;
  ss << str;
  ss >> num;
}