test9b use concatention in string.cpp

#include<iostream>
#include<string>
using namespace std;
int main()
//use concatention 
//dung cai nay de ghep lai cai ten .

{
     string first;
     cout<< "Enter your first name: ";
     cin>> first;

     string last;
     cout<<"Enter your last name : ";
     cin>> last;

     cout<< "Hello "<< first <<" "<<last << "! Welcome to c++";

     return 0;

}