(Polymorphic Banking Program Using Account Hierarchy) Develop a polymorphic bank
ID: 3625563 • Letter: #
Question
(Polymorphic Banking Program Using Account Hierarchy) Develop a polymorphic banking program using the Account hierarchy created in Exercise 12.10. Create a vector of Account pointers to SavingsAccount and CheckingAccount objects. For each Account in the vector, allow the user to specify an amount of money to withdraw from the Account using member function debit and an amount of money to deposit into the Account using member function credit. As you process each Account, determine its type. If an Account is a SavingsAccount, calculate the amount of interest owed to the Account using member function calculateInterest, then add the interest to the account balance using member function credit. After processing an Account, print the updated account balance obtained by invoking base class member function getBalance.Explanation / Answer
#include<iostream>
#include<vector>
#include<iomanip>
using namespace std;
class Account
{
public:
Account( double ); // constructor initializes balance
void setBalance( double ); // sets the account balance
double getBalance(); // return the account balance
virtual void credit( double );
virtual bool debit(double );
private:
double balance; // data member that stores the balance
}; // end class Account
// Account constructor initializes data member balance
Account::Account( double initialBalance )
{
// if initialBalance is greater than or equal to 0.0, set this value
// as the balance of the Account
if ( initialBalance >= 0.0 )
balance = initialBalance;
else // otherwise, output message and set balance to 0.0
{
cout << "Error: Initial balance cannot be negative." << endl;
balance = 0.0;
} // end if...else
} // end Account constructor
// credit (add) an amount to the account balance
void Account::credit( double amount )
{
balance = balance + amount; // add amount to balance
} // end function credit
// debit (subtract) an amount from the account balance
// return bool indicating whether money was debited
bool Account::debit( double amount )
{
if ( amount > balance ) // debit amount exceeds balance
{
cout << "Debit amount exceeded account balance." << endl;
return false;
} // end if
else // debit amount does not exceed balance
{
balance = balance - amount;
return true;
} // end else
} // end function debit
// set the account balance
void Account::setBalance( double newBalance )
{
balance = newBalance;
} // end function setBalance
// return the account balance
double Account::getBalance()
{
return balance;
} // end function getBalance
class SavingsAccount : public Account
{
public:
// constructor initializes balance and interest rate
SavingsAccount( double, double );
double calculateInterest(); // determine interest owed
private:
double interestRate; // interest rate (percentage) earned by account
}; // end class SavingsAccount
// constructor initializes balance and interest rate
SavingsAccount::SavingsAccount( double initialBalance, double rate )
: Account( initialBalance ) // initialize base class
{
interestRate = ( rate < 0.0 ) ? 0.0 : rate; // set interestRate
} // end SavingsAccount constructor
// return the amount of interest earned
double SavingsAccount::calculateInterest()
{
return getBalance() * interestRate;
} // end function calculateInterest
class CheckingAccount : public Account
{
public:
// constructor initializes balance and transaction fee
CheckingAccount( double, double );
virtual void credit( double );
virtual bool debit(double );
private:
double transactionFee; // fee charged per transaction
// utility function to charge fee
void chargeFee();
}; // end class CheckingAccount
// constructor initializes balance and transaction fee
CheckingAccount::CheckingAccount( double initialBalance, double fee )
: Account( initialBalance ) // initialize base class
{
transactionFee = ( fee < 0.0 ) ? 0.0 : fee; // set transaction fee
} // end CheckingAccount constructor
// credit (add) an amount to the account balance and charge fee
void CheckingAccount::credit( double amount )
{
Account::credit( amount ); // always succeeds
chargeFee();
} // end function credit
// debit (subtract) an amount from the account balance and charge fee
bool CheckingAccount::debit( double amount )
{
bool success = Account::debit( amount ); // attempt to debit
if ( success ) // if money was debited, charge fee and return true
{
chargeFee();
return true;
} // end if
else // otherwise, do not charge fee and return false
return false;
} // end function debit
// subtract transaction fee
void CheckingAccount::chargeFee()
{
Account::setBalance( getBalance() - transactionFee );
cout << "$" << transactionFee << " transaction fee charged." << endl;
} // end function chargeFee
int main()
{
// create vector accounts
vector< Account *> accounts(4);
// initialize vector with Accounts
accounts[ 0 ]=new SavingsAccount( 25.0, .03 );
accounts[ 1 ] = new CheckingAccount( 80.0, 1.0 );
accounts[2]= new SavingsAccount ( 200.0, .015 );
accounts[ 3 ] = new CheckingAccount( 400.0, .5 );
cout << fixed << setprecision( 2 );
double cr,db;
// loop through vector, prompting user for debit and credit amounts
for ( size_t i = 0; i < accounts.size(); i++ )
{
cout << "Account " << i + 1 << " balance: $" <<accounts[i]->getBalance();
/* Call the getBalance function through Account pointer i */;
double withdrawalAmount = 0.0;
cout << " Enter an amount to withdraw from Account "
<< i + 1 << ": ";
cin >> withdrawalAmount;
/* Call the debit function through Account pointer i */
accounts[i]->debit(withdrawalAmount);
double depositAmount = 0.0;
cout << "Enter an amount to deposit into Account " << i + 1 << ": ";
cin >> depositAmount;
accounts[i]->credit(depositAmount);
} // end for
return 0;
} // end main
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