int转string
#include <sstream>
int num = 100;
std::ostringstream ss;
ss << num;
cout << ss.str();
string转int
#include <sstream>
int num;
string str = "100";
std::istringstream ss(str);
ss >> num;
cout << num;
#include <sstream>
int num = 100;
std::ostringstream ss;
ss << num;
cout << ss.str();
#include <sstream>
int num;
string str = "100";
std::istringstream ss(str);
ss >> num;
cout << num;