Compare two text file in C++

file_compare.cpp

#include<iostream>
#include<fstream>
#include<conio.h>
using namespace std;

int main(){
    fstream f1, f2;
    char name[20], c1, c2;
    int flag=3;

    cout<<"Enter File 1 Name : ";
    cin>>name;
    f1.open(name,ios::in);
    if(f1==NULL)
        cout<<"File can't be opened"<<endl;

    cout<<"Enter File 2 Name : ";
    cin>>name;
    f2.open(name,ios::in);
    if(f2==NULL)
        cout<<"File can't be opened"<<endl;

    while(1){
        c1=f1.get();
        c2=f2.get();
        if(c1!=c2){
            flag=0;
            break;
        }
        if((c1==EOF)||(c2==EOF))
            break;
    }
    f1.close();
    f2.close();
    if(flag)
        cout<<"Files are same.";
    else
        cout<<"Files are not same.";

    return getch();
}