OOPS Interview Questions and Answers in 2025 (100+ Q&A)

OOPS

Ques:- What is a virtual function?

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Right Answer:
A virtual function is a member function in a base class that you expect to override in derived classes. It is declared using the keyword `virtual` and allows for dynamic (runtime) polymorphism, enabling the program to call the correct function based on the object's actual type rather than the type of the pointer/reference.

OOPS

Ques:- What is an Inline function?

Asked In :- belit,

Right Answer:
An inline function is a function that is expanded in line when it is called, rather than being invoked through the usual function call mechanism. This can improve performance by eliminating the overhead of a function call, especially for small, frequently called functions.

OOPS

Ques:- Define Destructor?

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Right Answer:
A destructor is a special member function in a class that is automatically called when an object of that class is destroyed. It is used to release resources or perform cleanup tasks before the object is removed from memory.

OOPS

Ques:- Define a constructor?

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Right Answer:
A constructor is a special method in a class that is automatically called when an object of the class is created. It is used to initialize the object's properties and allocate resources.

OOPS

Ques:- What are manipulators?

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Right Answer:
Manipulators are special functions in C++ that are used to modify the input/output format of streams. They can be used to change the way data is displayed or read, such as setting the width, precision, or filling characters in output streams. Examples include `std::endl`, `std::setw`, and `std::fixed`.

OOPS

Ques:- What is Inheritance?

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Right Answer:
Inheritance is a fundamental concept in object-oriented programming that allows a class (called a subclass or derived class) to inherit properties and behaviors (methods) from another class (called a superclass or base class). This promotes code reuse and establishes a hierarchical relationship between classes.

OOPS

Ques:- What is Polymorphism?

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Right Answer:
Polymorphism is a concept in object-oriented programming that allows objects to be treated as instances of their parent class, enabling a single interface to represent different underlying forms (data types). It typically manifests in two ways: method overriding (runtime polymorphism) and method overloading (compile-time polymorphism).

OOPS

Ques:- What is Encapsulation?

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Right Answer:
Encapsulation is the concept of bundling the data (attributes) and methods (functions) that operate on the data into a single unit, typically a class, and restricting access to some of the object's components to protect the integrity of the data.

OOPS

Ques:- What is an object?

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Right Answer:
An object is an instance of a class that contains data (attributes) and methods (functions) that operate on that data.

OOPS

Ques:- What is a class?

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Right Answer:
A class is a blueprint for creating objects in object-oriented programming. It defines properties (attributes) and behaviors (methods) that the objects created from the class will have.

OOPS

Ques:- Write basic concepts of OOPS?

Asked In :- jump trading llc,

Right Answer:
The basic concepts of OOP (Object-Oriented Programming) are:

1. **Encapsulation**: Bundling data and methods that operate on the data within a single unit or class, restricting access to some components.
2. **Abstraction**: Hiding complex implementation details and showing only the essential features of an object.
3. **Inheritance**: Allowing a new class to inherit properties and behaviors (methods) from an existing class, promoting code reuse.
4. **Polymorphism**: Enabling objects to be treated as instances of their parent class, allowing methods to be used in different ways based on the object type.

OOPS

Ques:- What is OOPS?

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Right Answer:
OOPS, or Object-Oriented Programming System, is a programming paradigm based on the concept of "objects," which can contain data and code. It emphasizes four main principles: encapsulation, inheritance, polymorphism, and abstraction.

The OOPS (Object-Oriented Programming Systems) category on takluu.com is designed for software developers and programming aspirants who want to strengthen their understanding of object-oriented principles. OOPS is a fundamental programming paradigm used widely across many languages such as Java, C++, Python, and more.

This section covers essential concepts including classes and objects, encapsulation, inheritance, polymorphism, abstraction, and interfaces. You’ll find interview questions that focus on both theory and practical application of these principles in real-world coding scenarios.

Interviewers often ask questions like:

“Explain the four pillars of OOPS.”
“How does inheritance promote code reusability?”
“What is polymorphism and how is it implemented?”

Our content presents these concepts in a simple and clear manner, supported by examples and coding snippets to help you grasp them easily. Whether you’re a beginner or preparing for advanced technical interviews, this category helps you build a strong foundation and confidently tackle OOPS-related questions.

At Takluu, we regularly update the OOPS category with new questions, coding challenges, and best practices to keep you ahead in your interview preparation journey.

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