CS201 GDB Solution 2024

CS201 - Introduction to Programming · GDB Solution · VU Nexus · Question Description

ATM system allows users to perform essential banking operations, such as checking balance, depositing funds, withdrawing cash, and exiting the system.

The ATM allows users to perform essential banking transactions, as follows:

Checking balance: Users can view their current account balance, providing a clear understanding of their available funds.

Making a deposit: Users can input an amount to deposit into their account, which updates the balance accordingly and confirms the successful transaction.

Withdrawing funds: Users can request to withdraw a specific amount of cash, with the program checking for sufficient funds before completing the transaction and displaying an appropriate message if the balance is insufficient.

As a C++ developer, your task is to create a simulation of an ATM system that enables users to carry out fundamental banking operations, such as checking their balance, depositing funds, and withdrawing funds. The program should start with an initial balance of zero and allow users to select an operation of their choice. Through user-defined functions, the program will efficiently handle each operation. Users can interact with program to choose their desired action, and the program updates and displays the balance accordingly.

Discuss how the program handles parameter passing in its functions, particularly through either call by value or call by reference. How can we implement call by value or call by reference methods in the deposit, withdrawal and checking balance functionalities of the ATM system to ensure the accuracy of the user’s current balance?

Answer

When implementing an ATM system using C++, selecting on the correct parameter passing mode to utilize for every function is really significant as a way to avoid account imbalance and system problems. Here’s how parameter passing can be effectively used for core functions:

1. Call by Reference: Consequently, for deposit and withdrawal useless, it is preferable to use call by reference. This approach modifies the balance variable of the user directly within the function, and hence in case of any additions or subtractions of the balance within this function, the main program will be able to access it since the variable is global. This method is very critical in this place because it help us to update the balance ‘as and when ‘to reduce on the possibility of making a wrong balance and also it ensures that the balance we display on the teller drawer is the same as the amount in that particular account balance.
2. Call by Value: On the other hand, call by value could be useful if we wanted to check the balance. Since check function cannot affect the balance but only capture its value then using value parameter avoids any chance of tampering with the balance data. This offers a clear vision of the balance while maintaining the variable intact from it’s modification or addition to.

To even more specificity call by reference is most fitting for deposit, as well as withdrawal functions because it allows for immediate updates on the user balance necessary for correct operations with an ATM. When it comes to work that there is no intention to change the state of the parameter, such as accessing the balance, call by value is beneficial in keeping such operations secure and fast. This balanced use of parameter passing makes the flow of the programs clearer and at the same time guarantees effective mechanisms of handling user transactions.