#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;
}
