水题/hdu 1012 u Calculate e

 1 /*
 2     PROBLEM:hdu 1012
 3     AUTHER:Nicole Lam
 4     MEMO:水题
 5 */
 6 #include<iostream>
 7 #include<iomanip>
 8 using namespace std;
 9 double a[10];
10 int main()
11 {
12     cout<<"n e"<<endl;
13     cout<<"- -----------"<<endl;
14     a[0]=1;
15     double temp=1.0;
16     cout<<"0 1"<<endl;
17     for (int i=1;i<=9;i++)
18     {
19         temp=temp*i;
20         a[i]=a[i-1]+(double)1/temp;
21         if (i==1) cout<<"1 2"<<endl;
22         else if (i==2) cout<<"2 2.5"<<endl;
23         else cout<<i<<" "<<fixed<<setprecision(9)<<a[i]<<endl;
24     }
25     return 0;
26 }