Question

What is an abstract class in C++?

(a) Class specifically used as a base class with atleast one virtual functions

(b) Class specifically used as a base class with atleast one pure virtual functions

(c) Class from which any class is derived

(d) Any Class in C++ is an abstract class

The question was asked in an interview for internship.

I'm obligated to ask this question of Abstract Classes topic in portion Derived Classes, Templates & Exception Handling in C++ of C++

Answer 1

Right answer is (b) Class specifically used as a base class with atleast one pure virtual functions

Easy explanation - An abstract class is defined as a class which is specifically used as a base class. An abstract class should have atleast one pure virtual function.