GCD of Two Numbers using Recursion

#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);
        return n1;


Enter two positive integers: 366
G.C.D of 366 and 60 is 6.

In this program, recursive calls are made until the value of n2 is equal to 0.

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