模拟银行ATM机的账户管理功能

1、实现用户的登录功能，要求用户输入账号和密码。登录失败应给出提示信息。

2、只允许同一个账号连续密码输入错误三次，超过三次程序结束。

3、登录成功后，提供以下功能：1为查询余额；2为存款功能；3为取款功能；4为修改密码；5为转账功能。（4和5为选做项目）。-Simulation Bank ATM machine account management function 1, to achieve the user' s login function, requiring the user to enter account number and password. Login failed message shall be given. 2, allowing only one account with the wrong password three times continuously, more than three times the program ends. 3, the login is successful, provide the following functions: 1 for balance inquiries　2 deposit function　3 for ATM functions　4 to change your password　5 for the transfer function. (4 and 5 are elected to do the project.)