VIPJAVA/01_JavaSe/JavaSe/day03/src/com/lc/day03/exer/ExerDoWhile07.java

package com.lc.day03.exer;

import java.util.Scanner;

/**
 * ClassName: ExerFor01
 * Package: com.lc.day03.exer
 * Description:
 *
 * @Author 爱扣钉-陈晨
 * @Create 2023/7/15 9:44
 * @Version 1.0
 */
public class ExerDoWhile07 {
    public static void main(String[] args) {
        /*
        =========ATM========
           1、存款
           2、取款
           3、显示余额
           4、退出
        请选择(1-4)：
         */
        //标识
        boolean flag = true;
        //余额
        double banance = 1000;
        //键盘输入
        Scanner scanner = new Scanner(System.in);
        do {
            System.out.println("=========ATM========");
            System.out.println("1、存款");
            System.out.println("2、取款");
            System.out.println("3、显示余额");
            System.out.println("4、退出");
            System.out.println("请选择");
            //选择
            int n = scanner.nextInt();

            switch (n){
                case 1:
                    System.out.println("请输入存款金额");
                    double v = scanner.nextDouble();
                    banance+=v;
                    break;
                case 2:
                    System.out.println("请输入取款金额");
                    double v1 = scanner.nextDouble();
                    if (v1 > banance){
                        System.out.println("余额不足");
                    }else {
                        banance -=v1;
                    }
                    break;
                case 3:
                    System.out.println("金额:"+banance);
                    break;
                case 4:
                    flag = false;
                    break;
                default:
                    System.out.println("操作有误重新输入");
                    break;
            }
        }while (flag);

        scanner.close();
    }
}