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Unit 1: C++ Fundamentals3 min read
Object-Oriented Programming (OOP) is a paradigm that revolutionized the way software is designed, written, and maintained. Instead of viewing a program as a sequence of steps, OOP models software as a collection of interacting objects.
Before OOP, most software was written using Procedural Programming. In languages like C, a program is divided into functions. Data is often passed globally or between functions, completely separate from the logic that manipulates it.
While procedural programming works well for small tasks, it struggles to scale. As programs grow, tracking which function modifies which data becomes a nightmare. OOP was created to solve this "spaghetti code" problem by binding data and functions tightly together into a single unit.
An object is a self-contained entity that consists of both data and procedures to manipulate the data.
By grouping state and behavior together, objects accurately map to real-world entities.
Every Object-Oriented language, including C++, Java, and Python, is built upon four foundational concepts:
Encapsulation is the mechanism of hiding data implementation by restricting access to public methods. It bundles the data (variables) and the code acting on the data (methods) together as a single unit (class). This prevents accidental interference and misuse.
Abstraction means hiding complex implementation details and showing only the essential features of the object. Think of a car: you know how to use the steering wheel and pedals, but you don't need to know how the internal combustion engine works to drive it.
Inheritance allows a new class (child) to inherit the properties and methods of an existing class (parent). This promotes code reusability and establishes a natural hierarchy between classes.
Polymorphism (meaning "many forms") allows objects of different types to be treated as objects of a common base type. It enables a single interface to represent different underlying forms (e.g., a draw() method could draw a circle, square, or triangle depending on the object it is called on).
A programming paradigm based on the concept of 'objects', which can contain data in the form of fields (attributes or properties) and code in the form of procedures (methods).
Procedural programming focuses on functions or procedures that operate on data, whereas OOP focuses on objects that combine both data and behavior.
The core principles defining OOP are Encapsulation, Abstraction, Inheritance, and Polymorphism.
Test your understanding with 3 questions
Which of the following is NOT a core pillar of Object-Oriented Programming?
What is the primary focus of Object-Oriented Programming?
Which programming paradigm relies heavily on global data and sequences of instructions?
2 Modules
2 Modules