account.cpp

Member-function definitions for class Account. 源代码

// Fig. M.02: Account.cpp
// Member-function definitions for class Account.
#include <iostream>
using std::cout;
using std::endl;

#include "Account.h" // include definition of class Account

// Account constructor initializes data member balance
Account::Account( int initialBalance )
{
   balance = 0; // assume that the balance begins at 0

   // if initialBalance is greater than 0, set this value as the
   // balance of the Account; otherwise, balance remains 0
   if ( initialBalance > 0 )
      balance = initialBalance;

   // if initialBalance is negative, print error message
   if ( initialBalance < 0 )
      cout << "Error: Initial balance cannot be negative.\n" << endl;
} // end Account constructor

// credit (add) an amount to the account balance
void Account::credit( int amount )
{
   balance = balance + amount; // add amount to balance
} // end function credit

// debit (subtract) an amount from the account balance
void Account::debit( int amount )
{
   if ( amount <= balance ) // debit amount does not exceed balance
      balance = balance - amount;
  
   else // debit amount exceeds balance
      cout << "Debit amount exceeded account balance.\n" << endl;
} // end function debit

// return the account balance
int Account::getBalance()
{
   return balance; // gives the value of balance to the calling function
} // end function getBalance