計算消費打折金額

Discount.java

package com.vincent.demo;

import java.util.*;

public class JavaMain {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        System.out.println("請輸入你的年齡");
        int age = scan.nextInt();

        System.out.println("請輸入你的消費金額");
        long money = scan.nextLong();

        double discount = getDiscountRate(age, money);
        String discountMsg = discount == 0
                ? "無打折"
                : String.format("可打%.0f折", (1 - discount) * 100);

        long actualMoney = Math.round(money * (1 - discount));

        System.out.printf("%s\n消費總金額：%d\n折扣後金額：%d",
                discountMsg, money, actualMoney);

        scan.close();
    }

    private static double getDiscountRate(int age, long money) {
        if (age == 30) {
            return 0.05;
        } else if (money >= 100000) {
            return 0.1;
        } else if (money >= 80000) {
            return 0.05;
        } else if (money >= 50000) {
            return 0.02;
        } else {
            return 0;
        }
    }

}

題目來源：
https://www.facebook.com/groups/406460463268219/permalink/544173856163545/