import java.util.Scanner;
public class Demo {
	public static void main(String[] args) {
		System.out.println("收銀臺收款程式2.0");
		Scanner scan=new Scanner(System.in);
		System.out.println("請輸入商品單價：");
		double cost=scan.nextDouble();
		System.out.println("請輸入商品數量：");
		double number=scan.nextDouble
 
();
		double money=cost*number;
		if (money<500){
			System.out.println("未滿500不打折");
		}else if(money>=500&&money<1000){
			money=money*0.8;
			System.out.println("滿500打8折");
			}else if(money>=1000){
			money=money*0.6;
			System.out.println("滿1000打6折");
			}
			System.out.println("應付金額："+money);
			System.
 
out.println("實付金額：");
			double net=scan.nextDouble();
			double change=net-money;
			if(net>=money){
				System.out.println("找零"+change);
			}else if(net<money){
				double lack=money-net;
				System.out.println("您給的錢少了，還差"+lack+"元。");
			}
	}
}

import java.util.Scanner;
public class Demo1
 
 {
	public static void main(String[] args) {
		System.out.println("收銀臺收款系統2.0");
		Scanner scan=new Scanner(System.in);
		System.out.println("請輸入單價：");
		double unitprice=scan.nextDouble();
		System.out.println("請輸入數量：");
		double amount=scan.nextDouble();
		System.out.println("請輸入金額：");
		double money=scan.nextDouble();
		double totalPrice=unitprice*amount;
		if(totalPrice>=500&&totalPrice<1000){
			totalPrice*=0.8;
			}
		if(totalPrice>=1000){
			totalPrice*=0.6;
		}
		if(totalPrice<=money){
			double change=money-totalPrice;
			System.out.println("總價為："+totalPrice+",找零："+change);
			}else {
				System.out.println("您給的錢不夠，還差："+(totalPrice-money));
			}
		}
}