ATM

代码说明：

  ATM 功能1.使用该提款机必须先注册 功能2 使用注册的用户名和密码登录使用本系统（校验） 以下三个功能用接口实现功能3 存钱功能4 取钱功能5 查询余额每次存 钱数+ 每次取钱 钱数-，余额>03、4、5——switch 校验 (ATM function 1 must first register to use the cash machines function 2 uses the registered user name and password to use the system (check) the following three functions with interface functionality 3 4 get money saving features functions balance each deposit 5 queries of money+ time withdrawals of money- the balance> 0 3,4,5- switch check)