sum_facs.cpp

几种计算阶乘、阶乘之和的算法

#include<stdio.h>
int fac(int n);
 int sum(int n);
void main()
{
	for( ; ; )
	{
	int n;
	printf("In put the number:");
	scanf("%d",&n);
	printf("%d\n",sum(n));
	}
}
int sum(int n)
{int s;
if(n==0)
return fac(n);
if(n>=1)
s=fac(n);
return s+sum(n-1);
}

 int fac(int n)
{
	 if(n==0)
return 1;
if(n!=0)
return n*fac(n-1);
}