C programming, Determine the greatest common divisor using a recursive approach.

#include <stdio.h>

int hcf(int n1, int n2);

int main() {

    int n1, n2;

    printf("Enter two positive integers: ");

    scanf("%d %d", &n1, &n2);

    printf("G.C.D of %d and %d is %d.", n1, n2, hcf(n1, n2));

    return 0;

}

int hcf(int n1, int n2) {

    if (n2 != 0)

        return hcf(n2, n1 % n2);

    else

        return n1;

}