hdoj1012

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
int n=1,i;
double e=0;
cout<<"n"<<" e"<<endl;
cout<<"- -----------"<<endl;
for(i=0 ; i<=9; i++)
{
if(i!=0)
           n=n*i;
e=e+(double)1/n;
if(i<3)
  cout<<i<<" "<<e<<endl;
else
cout<<fixed<<setprecision(9)<<i<<" "<<e<<endl;
}
return 0;
}