hdoj1012--u Calculate e

#include<iostream>
#include <iomanip>

using namespace std;

int main()
{
    int i,n;
    double s,t;
    cout<<"n e"<<endl;
    cout<<"- -----------"<<endl;
    cout<<"0 1"<<endl;
    cout<<"1 2"<<endl;
    cout<<"2 2.5"<<endl;
    s=2.5;
    n=2;
    for(i=3; i<=9; i++)
    {
        n=i*n;
        s+=1.0/n;
        cout<<i<<" "<<fixed<<setprecision(9)<<s<<endl;
    }
    return 0;
}