OOP Principles

Polymorphism means 'many forms'. In OOP, it allows objects of different classes to be treated as objects of a common superclass, with each class implementing the same method differently. This is achieved through virtual functions, function overloading, and operator overloading in C++.

A static variable in C++ retains its value between function calls and is initialized only once. It exists for the entire program duration, maintaining its value throughout execution. Unlike automatic variables, static variables do not get re-initialized on each function call.

Object-oriented programming is based on the concept of 'objects' which encapsulate data and behavior. Classes are the blueprints/templates for creating objects. While functions and variables exist in procedural programming, and overloading is a feature, classes are the essential foundation that defines a language as object-oriented.

C++ is a multi-paradigm language that supports object-oriented programming (classes, inheritance, polymorphism, encapsulation). While it also supports procedural and generic programming, its classification as an Object-Oriented Language is correct because it provides complete OOP features including classes, objects, inheritance, and virtual functions.

Memory leaks occur when programs allocate memory dynamically but lose all references to it, making it unreachable. The memory remains occupied but cannot be used or freed, causing gradual resource depletion.

Abstraction hides complex implementation details while exposing only necessary interfaces. This allows developers to work with high-level concepts without understanding underlying complexities, reducing code coupling.

Inheritance allows new classes to acquire properties and methods from existing classes, promoting code reuse. This hierarchical relationship reduces redundancy and enables polymorphic behavior through shared interfaces.

C++ introduced classes to support object-oriented programming and improve memory management. Classes provide constructors and destructors that automatically handle resource allocation and deallocation, unlike C's manual approach.

Pascal is a traditional procedural programming language without native support for OOP features like classes, inheritance, or polymorphism. C++, C#, and Java were designed as object-oriented languages from their inception.

Objects embody three fundamental characteristics: they exist at runtime (not compile time), are instantiations of class blueprints, and encapsulate both state (data) and behavior (methods) into a single unit.

Polymorphism allows a single interface to represent different underlying forms. A function can behave differently based on the object type it operates on, enabling flexible and extensible code through method overriding and overloading.

OOP provides data security through access specifiers (private, protected, public) and uses classes with constructors/destructors for better memory management. Pointers are not unique to OOP - they're a low-level feature present in procedural languages like C.