/* Program to compute n! */

#include <stdio.h>

int fact(int n);

int main() {
    int n;
    printf("Enter n: ");
    scanf("%d", &n);
    printf("%d! = %d\n",
	   n, fact(n));
    return 0;
}


/* Compute n! */
int fact(int n) {
    int x;

    if (n == 0) {
	return 1;
    }

    x = fact(n-1);
    return x * n;
}