I want to compare two user input strings, but not able to do so...

#include "stdafx.h"
#include "iostream"
#include "string"
using namespace std;

int _tmain(int argc, _TCHAR* argv0[])
{
    string my_string;
    string my_string2;
    cout<<"Enter string"<<endl;
    cin>>my_string;
    cout<<"Enter 2nd string"<<endl;
    cin>>my_string2;
    cout<<my_string<<"  "<<my_string2;
    strcmp(my_string,my_string2);
    int result;
    result= strcmp(my_string,my_string2);
    cout<<result<<endl;
    return 0;
}

This error is appearing. Error 1 error C2664: 'strcmp' : cannot convert parameter 1 from 'std::string' to 'const char *' c:\users\asad\documents\visual studio 2008\projects\string\string\string.cpp 23 String