HDOJ 1012 u Calculate e

import java.util.Scanner;

public class Main{

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("n e");
System.out.println("- -----------");
double sum = 0;
double j = 1;
for (int i = 0; i <= 9; i++) {
if (i==0) {
sum = 1;
System.out.println("0 1");
continue;
}
j *= i;
sum += 1.0/j;
if (i==1) {
System.out.println("1 2");
}
if (i==2) {
System.out.println("2 2.5");
}
if (i>2) {
System.out.printf("%d %.9f",i,sum);
System.out.println();
}
}
}
}