gistfile1.c

// 用递归法计算n!


#include <stdio.h>
long factorial (int n)
{
	long f;
	if(n <= 1) f = 1;
	else f = n * factorial(n - 1);
	return(f);
}
void main()
{
	int n;
	long y;
	printf("\ninput a integer number:\n");
	scanf("%d", &n);
	y = factorial(n);
	printf("%d != %ld\n", n, y);
}