阶乖怎么用C#实现

[anhao2008]

如题

[jy02870694]

http://www.cnblogs.com/aivdesign/articles/1258619.html

[moonshineidolon]

//计算每个数的阶乘,递归函数
static double f(int n)
{
if (n == 1)
return 1;
else
return n*f(n - 1);
}
//计算s(n)=1!+2!+3!+****+n!
static double S(int n){
double total=0;
for(int i=1;i<=n;i++){
total+=f(i);
}
return total;
}
static void Main()
{
while(true){
Console.WriteLine("Enter a number:");
int n = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("the resualt is {0}", S(n));
}

}
}

[zj49763554]

哈哈，2楼的解答真棒！