import java.util.Scanner;

/**
 * @author 苗晓强
 * @date 2023/7/25 16:12
 * 使用 do while 循环语句，模拟银行取钱、存钱、查询余额
 */
public class DoWhileTest {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double balance = 0.0;
        boolean flag = true;
        do {
            System.out.println("==========ATM=============");
            System.out.println("1、存款");
            System.out.println("2、取款");
            System.out.println("3、查询余额");
            System.out.println("4、退出");
            System.out.print("请输入您想要的服务选项：");
            int select = scanner.nextInt();
            switch (select){
                case 1:
                    System.out.println("请输入您要存款的金额：");
                    double money1 = scanner.nextDouble();
                    if (money1 > 0){
                        balance += money1;
                    }else {
                        System.out.println("您输入的存款金额有误，请重新输入！");
                    }
                    break;
                case 2:
                    System.out.println("请输入您要取款的金额：");
                    double money2 = scanner.nextDouble();
                    if (money2 > 0 && money2 <= balance){
                        balance -= money2;
                    }else {
                        System.out.println("您输入的取款金额有误，请重新输入！");
                    }
                case 3:
                    System.out.println("您的账户余额是：" + balance);
                    break;
                case 4:
                    flag = false;
                    break;
                default:
                    System.out.println("您输入的选项有误，请重新输入，谢谢。");
            }
        }while (flag);

        scanner.close();
    }
}