原题链接：http://acm.hdu.edu.cn/showproblem.php?pid=1012
题目名称：计算e
问题描述：
     
输入项：
无
测试用例：
无

public class Hdu1012 {public static void main(String[] args) {for (int i = 0; i <= 9; i++) {System.out.println("i为" + i + "时求得的e为：" + count(i));}}static double count(int a) {double sum = 0;for (int i = 0; i <= a; i++) {sum += 1 / factorial(i);}return sum;}static double factorial(int a) {if (a == 0) {return 1;}return a *= factorial(a - 1);}
}