递归求阶乘

递归求阶乘

j==0是递归判断结束的条件，必不可少，若无i==0则程序会一直运行下去

#include <stdio.h>
int main()
{
	int i;
	int fact(int i);	
	printf("5!=%d",fact(5));
}                  
int fact(int j){
	int sum;
	if (j == 0)
		sum = 1;
	else
		sum = j * fact(j - 1);
	return sum;
}