/*
 * compute n!
 *
 * this program has a bug -- comments omitted to hide it
 * used to demonstrate static and dynamic debugging
 *
 * Matt Bishop, ECS 36A, Fall 2019
 */
#include <stdio.h>

int nfact(int n)
{
	int x;

	x = nfact(n-1);

	return(n * x);
}

int main(int argc, char *argv[])
{
	int n;

	if (argc != 2 || sscanf(argv[1], "%d", &n) != 1){
		fprintf(stderr, "Usage: %s [ number ]\n", argv[0]);
		return(1);
	}

	printf("%d! = %d\n", n, nfact(n));

	return(0);
}