how to concatenate two strings

Here is code 

#include <iostream>

using namespace std;

int main()

{

    string s1, s2, result;

    cout << "Enter string s1: ";

    getline (cin, s1);

    cout << "Enter string s2: ";

    getline (cin, s2);

    result = s1 + s2;

    cout << "Resultant String = "<< result;

    return 0;

}