double fact(long n)
{
 if (n == 0l)
   return 1.0F;
 else
   return n * fact(n-1);
}

int main(void)
{
	static long n;
	printf("\nPro Enter number for factorial calculation n:");
	scanf("%ld", &n);
	printf("%ld! = %lf\n", n, fact(n));
	getch();
	return 0;
}