【菜鸟做水题】：杭电1008

#include"stdio.h"

double fac(int n)    //阶乘！！！！！！！！
{
    double out ;
    if( n == 0)
        out = 1;
    else if ( n == 1)
        out = 1;
    else
        out = n * fac(n - 1);
    return out;
}

int main()
{
   
    double result;
    printf("n e\n- -----------\n0 1\n1 2\n2 2.5\n");
    for(int i = 3; i < 10; i++)
    {
        result = 2.5;
        for(int j = 3; j <= i; j++)
        {
            result += 1.0/fac(j);
        }
        printf("%d %.9lf\n", i, result);
    }
    return 0;
    
}