递归方法求阶乘

# include <stdio.h>  

int fac(int n)
{
	int result = 0;
	if (n < 0)
	{
		printf("输入错误");
		return 0;
	}
	else if (n == 0 || n == 1)
	{
		result = 1;
	}
	else
	{
		result = fac(n - 1)*n;
	}
	return result;
}

int main()
{
	int n = 5;
	printf("%d的阶乘=%d\n",n,fac(n));
	return 0;
}