Question

Give an example of a large size task required program for C++ and divide the task into multiple classes based on your decision with a detailed explanation. Also, explain what functions can be in each of the divided classes, and how the classes are divided in a way that multiple developers can work together.

Answer 1

To demonstrate how we can divide a large-size task into smaller classes we can take the example of a banking application. From a very broad perspective, we can divide the tasks involved in the banking application into four different classes.

I Bank Front end Database Security | Backend Applications

The above taxonomy can be used while splitting the larger task into smaller classes.

The bank application mainly has to concern itself with the details of the customers and the online facilities that are provided to them. Additionally, the security aspects should also be taken care of so that no malicious identity can gain access to the system and in the process, loot the bank. To keep track of the customer details and their related application we create two classes one for Database and one that inherits the Database class to take care of the applications like getBalance().

To deal with the security aspect we declare the Security class which concerns itself with letting only authenticated users access the bank portal.

And finally, we also have a FrontEnd class to deal with how the application will look and feel, here this class is dedicated to designing the Graphical User Interface or the GUI of the bank application.

Functions that can be in each class:

FrontEnd: getscreenresolution(), designMenu() etc.

Database: inputCustomerDetails(), inputID() etc.

BackEnd: getBalance(), getTransactions(Date date) etc.

Security: authenticateUser(String Username, String Password) etc.

The classes are divided in such a manner that we can hide the unnecessary details and provide the developer with the specific information that he/she needs. For example, a frontend developer has no interest in the database as well as the security aspect of the program.

Also, the Database class has to be kept separate because it contains sensitive information that should not be made privy to the general public, this includes even the existing employees of the bank.

Multiple developers can work together to develop this program as the classes are designed to be mutually exclusive of each other. Here the frontend developers can work independently on their own module and the database, backend engineers can work separately on their own module. This results in modularity of the said program and multiple developers can work together to develop the application in a faster and better manner.