超市打折

import java.util.*;public class Test4{public static void main(String [] args){/*超市收银系统规定，消费满500元的可以打9.8折，消费满800元可以打9.5折，消费满1000元可以打9折，先要求输入消费数额，显示应收金额及折扣金额“您合计收费***元  本次收***元  为您节省***元*/Scanner sc = new Scanner(System.in);System.out.println("请输入您消费的总金额：");double cost = sc.nextDouble();double costs = cost;double save = 0;if(0 < cost){if(cost > 500){costs = cost * 0.98;save = cost - costs;}else if(cost > 800){costs = cost * 0.95;save = cost - costs;}else if(cost > 1000){costs = cost * 0.9;save = cost - costs;}}else{System.out.println("输入的数字不能为负数");}System.out.println("您合计收费"+cost+"元，本次收"+costs+"元，为您节省"+save+"元");}}