第四章3

package aaa;


import java.util.Scanner;


public class AK2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("请输入消费金额：");
double wang = input.nextDouble();
double zhang = 0;   //换购付款
int huang = 0; //换购项目
if(wang>=50){
System.out.println("是否参加优惠换购活动：");
System.out.println("1：满50元，加2元换购百事可乐饮料1瓶");
System.out.println("2：满100元，加3元换购500ml可乐一瓶");
System.out.println("3：满100元，加10元换购5公斤面粉");
System.out.println("4：满200元，加10元可换购1个苏泊尔炒菜锅");
System.out.println("5：满200元，加20元可换购欧莱雅爽肤水一瓶");
System.out.println("0：不换购");
System.out.print("请选择：");
if(input.hasNextInt()==true){
huang = input.nextInt();
switch(huang){
case 1:
if(wang>=50){
zhang = 2;
}
break;
case 2:
if(wang>=100){
zhang = 3;
}
break;
case 3:
if(wang>=100){
zhang = 10;
}
break;
case 4:
if  (wang>=200){
zhang = 10;
}
break;
case 5:
if(wang>200){
zhang = 20;
}
break;
default:
break;
}
}else{
System.out.println("请输入正确的数字！");
}
}

//结账
double total = wang + zhang;
System.out.println("本次消费总金额："+ total);
if(huang == 1){
System.out.println("成功换购：" + "百事可乐饮料1瓶。");
}else if(huang ==2 ){
System.out.println("成功换购：" + "500ml可乐一瓶。");
}else if(huang == 3){
System.out.println("成功换购：" + "5公斤面粉。");
}else if(huang == 4){
System.out.println("成功换购：" + "1个苏泊尔炒菜锅。");
}else if(huang == 5){
System.out.println("成功换购：" + "欧莱雅爽肤水一瓶。");
}else {
System.out.println("无换购项目！");
}
}

}