// Transaction.h
// Transaction abstract base class definition.
#ifndef TRANSACTION_H
#define TRANSACTION_H

class Screen; // forward declaration of class Screen
class BankDatabase; // forward declaration of class BankDatabase

class Transaction
{
public:
   // constructor initializes common features of all Transactions
   Transaction( int, Screen &, BankDatabase & );
    
   virtual ~Transaction() { } // virtual destructor with empty body
   
   int getAccountNumber() const; // return account number
   Screen &getScreen() const; // return reference to screen
   BankDatabase &getBankDatabase() const; // return reference to database

   // pure virtual function to perform the transaction
   virtual void execute() = 0; // overridden in derived classes
private:
   int accountNumber; // indicates account involved
   Screen &screen; // reference to the screen of the ATM
   BankDatabase &bankDatabase; // reference to the account info database
}; // end class Transaction

#endif // TRANSACTION_H


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