/*  Example Recursive Factorial
	Recursive calculation of Factorial
	Author: Peter Brusilovsky 
*/
#include <stdio.h>

int factorial(int i);

void main(){
	int i;
	
	printf("Enter an integer (non-negative): ");
	scanf("%d", &i);
	
	if(i >= 0) 
		printf("%d! = %d\n", i, factorial(i));
}

int factorial(int n) {
	if(n == 0)
		return 1;
	else
		return (n * factorial(n-1));
}