需求：編寫一個函數，輸入n為偶數時，調用方法求1/2+1/4+...+1/n,當輸入n為奇數時，調用函數1/1+1/3+...+1/n

package com.Summer_0511.cn;

import java.util.Scanner;

public class Test03 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入一個數字");
        double num = sc.nextDouble();
        
 
double sum = 0;
        if (num%2==0) {
            for (int i = 2; i <=num; i=i+2) {
                sum = sum+(1.0/i);//因為i為整數
            }
            System.out.println("輸入的偶數運算和為"+sum);
        } else {
            for (int i = 1; i <=num; i=i+2) {
                sum = sum+(1.0/i);
            }
            System.out.println(
 
"輸入的奇數運算和為"+sum);
        }
    }
}

編寫一個函數，輸入n為偶數時，調用方法求1/2+1/4+...+1/n,當輸入n為奇數時，調用函數1/1+1/3+...+1/n