具有多态的银行系统程序C++.doc

使用习题12.10中创建的Account类层次结构开发一个具有多态性的银行系统程序。创建一个Account指针的vector对象，其中的指针指向SavingsAccount 对象和CheckingAccount对象。对于该vector对象中每个Account ，允许用户使用成员函数debit指定要从Account取出的货币金额，并允许用户使用成员函数credit指定要存入该Account的货币金额。处理每个Account时，应判定它的类型。如果Account是SavingsAccount，就使用成员函数，就使用成员函数calculateInterest计算该Account应得的利息，然后使用成员函数credit把利息加到帐户余额上。处理完一个Account后，通过调用基类成员函数getBalance打印更新后的帐户余额。Account.h#ifndef ACCOUNT_H#define ACCOUNT_Hclass Accountpublic:Account( double = 0 );virtual bool credit( double );virtual bool debit( double );virtual 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#ifndef CHECKINGACCOUNT_H#define CHECKINGACCOUNT_H#include Account.hclass CheckingAccount:public Accountpublic:CheckingAccount( double = 0, double = 0 );virtual bool credit( double );virtual bool debit( double );private:double feechargedpertransaction;#endifCheckingAccount.cpp#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;bool 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 );return true;elsecout Trade Faided! endl;return false;bool CheckingAccount:debit( double withdraw ) / 取钱交易if ( Account:debit( withdraw ) = true )Account:debit( feechargedpertransaction ); / 同理 收取交易费相当于取钱return true;elsecout Trade Faided! endl;return false;test_Account.cpp#include using std:endl;using std:cout;using std:cin;#include using std:vector;#include #include Account.h#include SavingAccount.h#include CheckingAccount.hvoid virtualViaPointer( Account * const, SavingAccount &, CheckingAccount & );/用户通过此自定义函数进行交易int main()/初始化各个账户Account account( 2000.0 ); SavingAccount saving( 2000,0.1);CheckingAccount checking( 5000, 2 );vector accounts(3);/用vector指针指向各个账户accounts0 = &account;accounts1 = &saving;accounts2 = &checking;for(int i = 0; i 3; i+) /每个账户轮流执行交易virtualViaPointer( accountsi, saving, checking );return 0;void virtualViaPointer( Account * const baseClassPtr , SavingAccount & s, CheckingAccount & c)int t = 1, n;/通过比较是否指向同一个地址判断账户的类型是否相同if( baseClassPtr = &s )cout nis SavingAccountn;cout SavingAccount before operation is getBalance() endl;else if( baseClassPtr = &c )cout nis CheckingAccountn;cout CheckingAccount before operation is getBalance() endl;elsecout nis Accountn;cout Account before operation is getBalance() endl;while( t = 1 | t = 2 )cout n请选择服务：1:存款 2:取款 其他键:退卡. t;switch(t)case 1: cout n;cout credit( n );if( baseClassPtr = &s )SavingAccount *savingPtr = (SavingAccount*)baseClassPtr;/向下强制类型转换 来调用派生类中有而基类没有的函数baseClassPtr-credit( savingPtr-calculateInterest() );break;case 2: cout n;cout debit( n )