模拟实现银行ATM自动取款机系统。系统至少包括以下几方面的功能：

（1）用户登录功能：通过输入用户名和密码，正确时进入系统，错误则提示相应的错误信息并提示重新输入。（程序中可以初始几个用户对象，包括用户的姓名，账号，密码，余额等基本数据）

（2）修改密码功能：设置初始密码，当输入错误时提示信息并提示重新输入，当输入的次数超过2次则冻结银行卡，自动退出系统；

（3）余额查询功能：显示当前用户银行卡的余额数目；

（4）取款功能：通过输入金额，对存款进行扣款工作，当输入的金额大于余额时，则提示余额不足的信息，并重新输入；

（5）转账功能：当前用户可以向已经存在的某个用户进行转账，退出当前用户，通过登录对方账户查询余额检验转账操作是否成功

-Bank ATM ATM simulation system. The function of the system at least includes the following aspects:

(1) the user login function: by entering a user name and password, right into the system, the error indicates that the corresponding error message and prompt enter again. (can initial several user object in the program, including the user s name, account number, password, the basic data such as the balance)

(2) to modify the password function: the initial password set, when the input error message and prompts to enter, when the number of input more than 2 times the freezing of bank CARDS, automatic exit system

(3) balance query functions: display the current user the balance of bank card number

(4) withdrawal function: through the input amount, deductions for deposit, when the amount of input is greater than the balance, the hint of insufficient information, and to input

(5) transfer function: the current user may transfer to a user already exists, and exit the current user, thro