hdoj1012

 
#include<iostream>
using namespace std;
int main()
{
    int f[10]={1,1,2};
    double e[10]={1.0,2.0,2.5};
    cout <<"n e\n";
    cout <<"- -----------\n";
    cout <<"0 1\n";
    cout <<"1 2\n";
    cout <<"2 2.5\n";
    for( int i =3;i < 10;i ++)
    {
         f[i]=f[i-1]*i;
         e[i]=e[i-1]+1.0/f[i];
         cout.precision(9);
         cout << i<<" "<< fixed << e[i]<< endl;
         }
         
   system("pause");
}