计算n的阶乘的俩种方法

#include <stdio.h>

int main(void)
{
	int a, i;
	long factorial=1;  //long变量以带符号的64位（8字节）整数形式存储，取值范围为-92223372036854到.....

	printf("enter an interage:");
	scanf("%d", &a);
	
	for(i=1; i<=a; i++)
	{
		factorial *= i;
	}
	
	printf("%d\n", factorial);

	return 0;
}

#include <stdio.h>
int facto();
int main(void)
{
	int a;
	int factorial;

	printf("enter an interage:");
	scanf("%d", &a);
	factorial=facto(a);//求阶乘的递归函数调用

	printf("\ninterage %d factorial is: %d\n", a, factorial);
	
	return 0;
}
int facto(int x)//定义了一个求阶乘的递归函数
{
	if((x==1)||(x==0))
		return 1;
	else
		return (x*facto(x-1));
}