Files in C

#include <stdio.h>
int main()
{
    int v1, v2, sum;
    FILE *fp, *fpw;
    fp = fopen("F:\\input.txt", "r");
    fpw = fopen("F:\\output.txt", "w");
    while(fscanf(fp, "%d %d", &v1, &v2) != EOF)
    {
        sum = v1 + v2;
        fprintf(fpw, "Sum of %d and %d is = %d\n", v1, v2, sum);
    }
    fclose(fp);
    fclose(fpw);
    return 0;
}