Double file input

//Double file input
#include <bits/stdc++.h>
#define endl "\n"
using namespace std;

int main()
{

    FILE *f1, *f2;
    int n1, n2;
    //cout << "Hello Robert" << endl;
    f1 = fopen("in1.txt", "r");
    f2 = fopen("in2.txt", "r");

    while(fscanf(f1, "%d", &n1) != EOF)
    {
        //cout << "here" << endl;
        fscanf(f2, "%d", &n2);
        cout << n1 + n2 << endl;
    }

    return 0;
}