编写一个Java程序,计算并输出算式1-1/2+1/3-1/4+.......+1/99-1/100 的结果.

package zhidao;public class Calc{ public static void main ( String[] args ) { System.out.println (calc (100)); } private static double calc ( int n ) { if (n == 1) { return 1 / 1.d; } else { return Math.pow (-1, n - 1) * 1.d / n + calc (