20170728 JAVA利用循环和选择语句解决购物车问题

package com.chy.good;

import java.util.Scanner;

public class Jiesuan {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
final double ts = 245.0;
int t = 0;
final double shoe = 570.0;
int s = 0;
final double pai = 200.0;
int p = 0;
double price = 0.0;
int r = 1;
String str = null;
System.out.println("********************************************************");
System.out.println("请选择购买的商品编号：");
System.out.println("1、T 恤            2、网球鞋            3、网球拍");
System.out.println("********************************************************");
do {
System.out.print("请输入商品编号：");
int num = sc.nextInt();
System.out.print("请输入购买数量：");
switch (num) {
case 1:
t = sc.nextInt();
System.out.println("T恤 ￥245.0\t数量:" + t + "合计￥" + ts * t);
price += 245 * t;
System.out.println("是否继续y/n");
str = sc.next();
break;
case 2:
s = sc.nextInt();
System.out.println("网球鞋 ￥570.0\t数量:" + s + "合计￥" + shoe * s);
price += 570 * s;
System.out.println("是否继续y/n");
str = sc.next();
break;
case 3:
p = sc.nextInt();
System.out.println("网球拍 ￥200.0\t数量:" + p + "合计￥" + pai * p);
price += 200 * p;
System.out.println("是否继续y/n");
str = sc.next();
break;
}
} while (str.equals("y"));
System.out.println("折扣：0.8");
System.out.println("应付金额：" + price);
System.out.println("实付金额：" + 0.8 * price);
System.out.println("找钱：" + 0.2 * price);
}
}