C++中的Concat字符串和数字？

#include<iostream>
#include<string>
#include <sstream>

int main() {
    std::string str = "Hello";
    int num = 42;

    std::ostringstream oss;
    oss<< str<< num;
    std::string result = oss.str();

    std::cout << "Concatenated string: "<< result<< std::endl;

    return 0;
}