u Calculate e

 1 public class Main{
 2     public static void main(String args[]) {
 3         System.out.println("n e
" + 
 4                 "- -----------");
 5         for(int i=0;i<10;i++) {
 6             System.out.print(i+" ");
 7             if(i==0) {
 8                 System.out.println(1);
 9                 continue;
10             }
11             if(i==1) {
12                 System.out.println(2);
13                 continue;
14             }
15             if(i==2) {
16                 System.out.println(2.5);
17                 continue;
18             }
19             double sum=1;
20             double mul=1;
21             for(int j=2;j<=i;j++) {
22                 mul*=j;
23                 sum+=1/mul;
24             }
25             sum+=1;
26             System.out.printf("%.9f",sum);
27             System.out.println();
28         }
29     }
30 }