hcf and lcm using recursion

#include <stdio.h>

long gcd(long, long);

int main() {

long x, y, hcf, lcm;

printf("Enter two integers\n");

scanf("%ld%ld", &x, &y);

hcf = gcd(x, y);

lcm = (x*y)/hcf;

printf("Greatest common divisor of %ld and %ld = %ld\n", x, y, hcf);

printf("Least common multiple of %ld and %ld = %ld\n", x, y, lcm);

return 0;

}

long gcd(long a, long b) {

if (b == 0) {

return a;

}

else 

{

return gcd(b, a % b);

}

}