一个与银行账户相关的管理程序。银行的所有账户都可以存款和取款。

存款能够产生一定的利息，查询和取款交易要缴纳一定的手续费。

派生类： SavingAccount 和 CheckingAccount； SavingAccount：继承 Account 的成员函数；构造函数接收两个参数：存

款初始值（ initialBalance）和利率（ rate）；增加一个数据成员：利率(interestRate)，

增加 public 类型的成员函数用于计算利率(calculateInterest())。 CheckingAccount：构造函数应接收到两个参数，一个是存款初始值

（initialBalance ）， 一 个 是 手 续 费 （fee ）； 增 加 一 个 数 据 成 员 ： 手 续 费

（ transactionFee）；重新定义成员函数 credit()和 debit()，以便能够从存款余额中

减去手续费，要求成员函数通过调用基类的成员函数来更新存款数目

-A bank account and related administrative procedures. All bank account deposits and withdrawals can be.

The deposit can produce a certain interest, inquiries and withdrawal transaction to pay a certain fee.

Derived classes: SavingAccount and CheckingAccount　SavingAccount: Account inherited member function　constructor accepts two parameters: Store

Section initial value (initialBalance) and interest rates (rate)　add a data member: Interest rate (interestRate),

Increase public type of member function is used to calculate the interest rate (calculateInterest ()). CheckingAccount: constructor should receive two parameters, one is the initial value of the deposit

(InitialBalance), one is the fee (fee)　add a data member: Fee

(TransactionFee)　redefine member functions credit () and debit (), to enable the free balance

Minus fees, requires member function to update the number of deposit by calling the base class member function