Question

Use of const member function in a program _________________________

(a) Is mandatory, always

(b) Is optional, always

(c) Is mandatory, if objects are used

(d) Is optional, if const objects are used

The question was asked during an internship interview.

This intriguing question originated from Constant Member Functions in chapter Member Functions & its Types of Object Oriented Programming

Answer 1

Correct choice is (b) Is optional, always

Explanation: The use of const member functions is not mandatory. If const objects are involved then there is a high use of const member functions too. But there is no mandatory condition.