C++大学教程第13章实验报告
姓名：班级：计科1203
日期：2013. 11. 27 学号：
实验六（13.16）
使用Account类层次结构开发的多态性的银行系统1、代码实现：
// Account.h
#ifndef ACCOUNT_H
#define ACCOUNT_H
class Account
{
public:
Account( double = 0.0 );
virtual void credit(double);
virtual bool debit(double);
void setBalance(double);
double getBalance( );
private:
double balance;
};
# endif
// Account.cpp
#include
using std::cout;
using std::cin;
using std::endl;
using std::cerr;
#include"Account.h"
Account::Account( double b )
{
if(b < 0)
{
balance = 0.0;
cerr << "Error: an invalid value !" << endl;
}
else
balance = b;
}
void Account::credit( double amount)
{
balance = balance + amount;
}
bool Account::debit(double amount )
{
if(amount <= balance)
{
balance = balance - amount;
return true;
}
else
{
cout << "Debit amount exceeded account balance !";
return false;
}
}
void Account::setBalance( double newBalance )
{
balance = newBalance;
}
double Account::getBalance( )
{
return balance;
}
// SavingsAccount.h
#include"Account.h"
#ifndef SAVINGSACCOUNT_H
#define SAVINGSACCOUNT_H
class SavingsAccount : public Account
{
public:
SavingsAccount(double, double = 0.0);
~SavingsAccount();
double caculateInterest( );
private:
double interestrate;
};
#endif
// SavingsAccount.cpp
#include
using std::cout;
using std::cin;
using std::endl;
#include"SavingsAccount.h"
SavingsAccount::SavingsAccount( double b, double i) :Account( b )
{
interestrate = i;
}
SavingsAccount::~SavingsAccount( )
{
}
double SavingsAccount::caculateInterest( )
{
double interest;
interest = Account::getBalance( ) * interestrate;
return interest;
}
// CheckingAccount.h
#include"Account.h"
#ifndef CHECKINGACCOUNT_H
#define CHECKINGACCOUNT_H
class CheckingAccount:public Account
{
public:
CheckingAccount(double,double = 0.0);
void setFeechargedpertransaction(double);
double getFeechargedpertransaction();
virtual void credit(double);
virtual bool debit(double);
private:
double feechargedpertransaction;
};
#endif
// CheckingAccount.cpp
#include
using std::cout;
using std::cin;
using std::endl;
#include"CheckingAccount.h"
CheckingAccount::CheckingAccount(double b,double f)
:Account ( b )
{
feechargedpertransaction = f;
}
void CheckingAccount::setFeechargedpertransaction( double f ) {
cout << "enter feechargedpertransaction :" << endl;
cin >> f;
feechargedpertransaction = f;
}
double CheckingAccount::getFeechargedpertransaction( )
{
return feechargedpertransaction;
}
void CheckingAccount::credit( double a )
{
Account::credit( a );
}
bool CheckingAccount::debit(double a)
{
return Account::debit( a );
}
//testAccount.cpp
#include
using std::cout;
using std::endl;
using std::fixed;
#include
using std::setprecision;
#include
using std::vector;
#include"Account.cpp"
#include"SavingsAccount.cpp"
#include"CheckingAccount.cpp"
int main()
{
vector < Account * > accounts(4);
accounts[ 0 ] = new SavingsAccount( 25.0, 0.03 );
accounts[ 1 ] = new CheckingAccount( 80.0, 1.0 );
accounts[ 2 ] = new SavingsAccount( 200.0, 0.02 );
accounts[ 3 ] = new CheckingAccount( 400.0, 1.5 );
cout << fixed << setprecision( 2 );
for( size_t i = 0; i < accounts.size(); i ++ )
{
cout << "Account" << i + 1 << "original balance: $"<< accounts[i]->getBalance() << endl;
cout << "\nwithdraw $260.00 from Account " << i + 1 << ".\n";
accounts[i]->debit( 260.0 ); // 取款
cout << "\nUpdated Account" << i + 1 << "balance: $"<< accounts[i]->getBalance() << endl;
cout << "\ndeposit $150.00 into Account " << i + 1 << ".\n";
accounts[i]->credit( 150.0 ); // 存款
cout << "UpdatedAccount" << i + 1 << " balance: $"<< accounts[i]->getBalance() << endl;
SavingsAccount *savingsAccountPtr = ( SavingsAccount * ) accounts[i];
CheckingAccount *checkingAccountPtr = ( CheckingAccount * ) accounts[i];
if ( i % 2 == 0) //存款账户
{
if ( savingsAccountPtr != NULL )
{
double interestEarned = savingsAccountPtr->caculateInterest();
cout << "\nAdding $" << interestEarned << " interest to Account "
<< i + 1 << "(a SavingsAccount)" << endl;
savingsAccountPtr->credit( interestEarned ); //存款后计算本利和
}
cout << "Updated Account " << i + 1 << " balance: $"
<< savingsAccountPtr->getBalance()<< "\n\n";
}
else //支票账户
{
if ( checkingAccountPtr != NULL )
{
double feeLost = checkingAccountPtr->getFeechargedpertransaction();
cout << "\nSubstracting $" << feeLost << " fee to Account "
<< i + 1 << " (a checkingAccount) " << endl;
checkingAccountPtr->debit( feeLost );
}
cout << "Updated Account " << i + 1 << " balance: $"
<< checkingAccountPtr->getBalance()<< "\n\n";
}
}
return 0;
}
2、测试结果：