Question

Which among the following best defines the abstract methods?

(a) Functions declared and defined in base class

(b) Functions only declared in base class

(c) Function which may or may not be defined in base class

(d) Function which must be declared in derived class

The question was asked by my college director while I was bunking the class.

My question is based upon Abstract Function topic in chapter Member Functions & its Types of Object Oriented Programming

Answer 1

Right answer is (b) Functions only declared in base class

To explain I would say: The abstract functions must only be declared in base class. Their definitions are provided by the derived classes. It is a mandatory condition.