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");
	}
}