import java.util.Scanner;
public class ConsumeSavePlan {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("請輸入消費金額：");
double money = input.nextDouble();
double extra = 0; //換購付款
int choice = 0; //換購項目
if(money>=50){
System.out.println("是否參加優惠換購活動：");
System.out.println("1：滿50元，加2元換購百事可樂飲料1瓶");
System.out.println("2：滿100元，加3元換購500ml可樂一瓶");
System.out.println("3：滿100元，加10元換購5公斤麪粉");
System.out.println("4：滿200元，加10元可換購1個蘇泊爾炒菜鍋");
System.out.println("5：滿200元，加20元可換購歐萊雅爽膚水一瓶");
System.out.println("0：不換購");
System.out.print("請選擇：");
if(input.hasNextInt()==true){
choice = input.nextInt();
switch(choice){
case 1:
if(money>=50){
extra = 2;
}
break;
case 2:
if(money>=100){
extra = 3;
}
break;
case 3:
if(money>=100){
extra = 10;
}
break;
case 4:
if(money>=200){
extra = 10;
}
break;
case 5:
if(money>200){
extra = 20;
}
break;
default:
break;
}
}else{
System.out.println("請輸入正確的數字！");
}
}