2 STRING SAME OR NOT (DIFFERENT) IN C++

#include <iostream>
#include <string.h>
using namespace std;

int main ()
{
    char S1 [1000];
    char S2 [1000];
    int S3 ;


    cout<<"PLEASE ENTER A STRING : ";
    cin>>S1;

    cout<<"PLEASE ENTER ANOTHER STRING : ";
    cin>>S2;

    S3 = strcmp(S1,S2);

    if (S3 == 0)
    {
        cout<<S1<<" & "<<S2<<" ARE SAME"<<endl;
    }
    else
    {
        cout<<S1<<" & "<<S2<<" ARE NOT SAME"<<endl;
    }


    return 0;
}

OUTPUT