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.（Account继承层次）创建一个银行账户的继承层次，表示银行的所有客户账户。所有的客户都能在他们的银行账户存钱，取钱，但是账户也可以分成更具体的类型。例如，一方面存款账户SavingAccount依靠存款生利，另一方面，支票账户CheckingAccount对每笔交易（即存款或取款）收取费用。创建一个类层次，以Account作为基类， SavingAccount和CheckingAccount作为派生类。基类Account应该包括一个double类型的数据成员balance，表示账户的余额。该类应提供一个构造函数，接受一个初始余额值并用它初始化数据成员balance。而且构造函数确认初始余额的有效性，保证它大于等于0。如果小于0，则需将其置为0，并显示出错信息，表明该初始化余额是一个无效的值。该类应当提供三个成员函数。成员函数credit可以向当前余额加钱；成员函数debit负责从账户中取钱，并且保证账户不会被透支。如果提取金额大于账户金额，函数将保持balance不变，并打印信息“Debit amount exceeded account balance”；成员函数getBalance则返回当前balance的值派生类SavingAccount不仅继承了基类Account的功能，而且还应提供一个附加的double类型数据成员interestrate表示这个账户的比率（百分比）。 SavingAccount的构造函数应接受初始余额值和初始利率值，还应提供一个public成员函数caclculateInterest，返回代表账户的利息的一个double值，这个值是balance和interestrate的乘积。注意：类SavingAccount应继承成员函数credit和debit，不需要重新定义。派生类CheckingAccount不仅继承了基类Account的功能，还应提供一个附加的double类型数据成员表示每笔交易的费用。 CheckingAccount的构造函数应接受初始余额值和交易费用值。类CheckingAccount需要重新定义成员函数credit和debit，当每笔交易完成时，从balance中减去每笔交易的费用。重新定义这些函数时应用（即调用）基类Account的这两个函数来执行账户余额的更新。 CheckingAccount的debit函数只有当钱被成功提取时（即提取金额不超过账户余额时）才应收取交易费。提示：定义Account的debit函数使它返回一个bool类型值，表示钱是否被成功提取。然后利用该值决定是否需要扣除交易费。当这个层次中的类定义完毕后，编写一个程序，要求创建每个类的对象并测试他们的成员函数。将利息加到SavingAccount对象的方法是：先调用它的成员函数caclculateInterest，然后将返回的利息数传递给该对象的credit值。Account.h#ifndef ACCOUNT_H#define ACCOUNT_Hclass Accountpublic:Account( double = 0 );bool credit( double );bool debit( double );double getBalance()return balance;private:double balance;#endifAccount.cpp#include using std:endl;using std:cout;#include Account.hAccount:Account( double YuE )if( YuE = 0 )balance = YuE;elsebalance = 0;cout Unvalid input! Balance is setted to 0! endl; / 不合要求输出提示信息bool Account:credit( double deposit ) / 存钱cout you are crediting or get interest deposit yuan = 0 )balance += deposit;return true;elsecout Wrong deposit! You cant deposit less than 0 yuan! ; / 不合要求输出提示信息return false;bool Account:debit( double withdraw ) / 取钱cout you are debiting or paying the fee charged for this transaction withdraw yuan = 0 & withdraw = balance )balance -= withdraw;return true;elsecout Debit amount exceeded account balance, or you wrongly withdraw less than 0 yuan!; / 不合要求输出提示信息return false;SavingAccount.h#ifndef SAVINGACCOUNT_H#define SAVINGACCOUNT_H#include Account.hclass SavingAccount:public Accountpublic:SavingAccount( double = 0, double = 0 );double calculateInterest() / 计算利息return interestrate * getBalance();private:double interestrate;#endifSavingAccount.cpp#include using std:endl;using std:cout;#include SavingAccount.hSavingAccount:SavingAccount( double YuE, double LiLv ):Account( YuE ) / 为基类中的数据成员初始化if( LiLv = 0 & LiLv = 1 )interestrate = LiLv;elseinterestrate = 0;cout Unvalid input! Interestrate is setted to 0! endl; / 不合要求输出提示信息cout saving interestrate is interestrate endl;CheckingAccount.h#include using std:endl;using std:cout;#include CheckingAccount.hCheckingAccount:CheckingAccount( double YuE, double JiaoYiFei ) / 构造函数初始化余额和交易额:Account( YuE )if( JiaoYiFei = 0 )feechargedpertransaction = JiaoYiFei;elsefeechargedpertransaction = 0;cout Unvalid input! Feechargedpertransaction is setted to 0! endl; / 不合要求输出提示信息cout fee charged for per transaction is feechargedpertransaction endl;void CheckingAccount:credit( double deposit ) / 存钱交易if( Account:credit( deposit ) = true ) / 收取交易费相当于取钱Account:debit( feechargedpertransaction );elsecout Trade Faided! endl;void CheckingAccount:debit( double withdraw ) / 取钱交易if ( Account:debit( withdraw ) = true ) / 同理 收取交易费相当于取钱Account:debit( feechargedpertransaction );elsecout Trade Faided! endl;test_Account.cpp#include using std:endl;using std:cout;#include Account.h#include SavingAccount.h#include CheckingAccount.hint main()Account account( 2000.0 );SavingAccount saving( 1500, 0.05 );CheckingAccount checking( 5000, 2 );/测试基类对象cout nAccount befor operate is account.getBalance() endl;account.credit( 222 );cout Account after credit is account.getBalance() endl;account.debit( 2500 );cout Account after debit is account.getBalance() endl;/测试存款账户对象cout nSavingAccount befor operate is saving.getBalance() endl;saving.credit( saving.calculateInterest() );/ 将利息加到余额上利用存款cout SavingAccount after credit is saving.getBalance() endl;saving.debit( 200 );cout SavingAccount after debit is saving.getBalance() endl;/测试支票账户cout nCheckingAccount befor operate is chec