Delve into Object-Oriented Programming in C++ and discover key concepts like classes, objects, inheritance, and polymorphism to create efficient, reusable, and secure code through hands-on challenges.

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Object-oriented programming (OOP) has been around for decades. If you have a basic understanding of C++ and are interested in leveling up your skills, this class will help you do just that. 

Starting with an overview of the basics, you’ll dive into understanding the time-honored technique for implementing complex applications using user-defined classes. Followed up by discussing classes and objects, and then building up to the high-level topics including inheritance and polymorphism. 

Throughout the course, you’ll be fully immersed in OOP for C++, with illustrations, exercises, quizzes, and hands-on challenges every step of the way. You’ll walk away with an understanding of classes and objects behavior and be able to easily create simple, efficient, reusable and secure code.

Learn Object-Oriented Programming in C++

# Abstract Class

We can only make derived class's objects to access their functions, and we will never want to instantiate objects of a base class, we call it an `abstract` class. Such a class exists only to act as a parent of derived classes that will be used to instantiate objects.

# How to Write a Pure Virtual Function? 

It may also provide an interface for the class hierarchy by placing at least one pure virtual function in the base class. A pure virtual function is one with the expression `=0` added to the declaration. 

## `=0` Sign

The equal sign `=` here has nothing to do with the assignment, the value 0 is not assigned to anything. The `=0` syntax is simply how we tell the compiler that a virtual function will be pure.

# Overriding Virtual Function

Once you’ve placed a pure virtual function in the base class, you must override it in all the derived classes from which you want to instantiate objects. If a class doesn’t override the pure virtual function, it becomes an abstract class itself, and you can’t instantiate objects from it (although you might from classes derived from it). For consistency, you may want to make all the virtual functions in the base class pure.

In this lesson, we'll be learning about a very important concept of polymorphism, i.e.,  Pure Virtual Member Functions.

Introduction

Functions

Pointers

Classes

OOP in C++ Exam 1

Data Hiding

Inheritance

Polymorphism

Composition, Aggregation and Association

OOP in C++ Exam 2

Pure Virtual Member Functions

Abstract Class