100 C++ Interview Questions

1. What is OOP?

OOP stands for Object Oriented Programming. OOP is a programming paradigm that relies on the concept of classes and objects. It is used to structure a software program into simple reusable pieces of code blueprints (usually called classes) which are used to create individual instances of objects.

C is a procedural a language and yet C++ is an Object Oriented language because it has classes and can take advantage of polymorphism.

2. What is a Class?

Class is a blue print which reflects the entity’s attributes and actions. Technically defining a class is designing a user defined data type.
Here is a simple example class in C++.

class Window {
public:
     Window();
     ~Window();
};

3. What is an Object?

An instance of a class is called an object

You can create a Window object like this:

Window window;

That is an instance of the Window class, ie, a Window object.

4. List the types of inheritance supported in C++

Single Inheritance — the derived class inherits only one base class. It allows reusability of features inherited from the base class also called the parent class or superclass.