Program to Find HCF of Two Numbers using Recursion

#include <stdio.h>
int hcf(int, int);
main()
{
int h, i, a, b;
printf("\nEnter values of two numbers: ");
scanf("%d %d", &a, &b);
h = hcf(a, b);
printf("\nHCF of numbers is: %d", h);
getch();
}
int hcf(int a, int b)
{
if (a%b == 0)
return b;
else
return hcf(b, a%b);
}