C++ int到字符串转换

#include <iostream>
#include <sstream>

int main()
{
    int num = 42;
    std::stringstream ss;
    ss << num;
    std::string str;
    ss >> str;
    std::cout << str << std::endl;
    return 0;
}

#include <iostream>
#include <string>

int main()
{
    int num = 42;
    std::string str = std::to_string(num);
    std::cout << str << std::endl;
    return 0;
}