bank

代码说明：

  这是我的一个作业，关于C++编程的，做的是一个银行系统，能够实现存钱，取钱，转账，或者超额透支等等，是通过类来实现的(This is one of my homework, about c++ programming, do is a banking system, can realize save and withdraw money, transfer, or excessive overdraft, and so on, are realized through the class)