import java.util.Scanner;


public class Code010 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		String name = "";       
		double price = 0.0;    
		int goodsNo = 0;      
		int amount = 0;       
		double discount = 0.8;    
		double total = 0.0;      
		double money = 0.0;     
		System.out.println("MyShopping 管理系统    > 购物结算\n");        
		System.out.println("*************************************************** **");    
		System.out.println("请选择购买的商品编号：");    
		System.out.println("1.T 恤\t\t2.网球鞋\t\t3.网球拍");    
		System.out.println("*************************************************** **\n");   
		String answer = "y";     
		while("y".equals(answer)){     
			System.out.print("请输入商品编号：");   
			goodsNo = input.nextInt();     
			System.out.print("请输入购买数量：");    
			amount = input.nextInt();    
			switch(goodsNo){    
			case 1:      
				name = "T 恤";     
				price = 245.0;     
				break;    
			case 2:      
				name = "网球鞋";     
				price = 570.0;     
				break;    
			case 3:      
				name = "网球拍";     
				price =320.0;     
				break;    
			}     
			total = price * amount;     
			System.out.println(name + "￥" + price + "\t" + "数量" + amount +   "\t合计￥" + total);     
			System.out.println("是否继续(y/n)");    
			answer = input.next();    
			System.out.println();     
			money += total;    
		}    
		System.out.println("折扣：" + discount);    
		System.out.println("应付金额：" + (money * discount));   
		System.out.print("实付金额：");     
		double payment = input.nextDouble(); 
		System.out.println("找钱：" + (payment - money * discount));
	}

}