Question

Which is the correct statement about pure virtual functions?

(a) They should be defined inside a base class

(b) Pure keyword should be used to declare a pure virtual function

(c) Pure virtual function is implemented in derived classes

(d) Pure virtual function cannot implemented in derived classes

This question was addressed to me during an internship interview.

This interesting question is from Abstract Classes in section Derived Classes, Templates & Exception Handling in C++ of C++

Answer 1

The correct option is (c) Pure virtual function is implemented in derived classes

The explanation is: A pure virtual function does not have a definition corresponding to base class. All derived class may or may not have an implementation of a pure virtual function. there is no pure keyword in C++.