Program to concatenate two strings in CPP

Source Code:
#include<iostream>
#include<string.h>
using namespace std;
int main()
{
string c1,c2,c3;
cout<<"Enter first string: ";
getline(cin,c1);
cout<<"Enter second string: ";
getline(cin,c2);
c3 = c1 + c2;
cout<<"The concatenated string is: ";
cout<<c3;
return 0;
}

Program Output: