Question

Which among the following can be used in place of default constructor?

(a) constructorName(int x, int y=0)

(b) constructorName(int x=0, int y=0)

(c) constructorName(int x=0, int y)

(d) constructorName(int x, int y)

I got this question by my school principal while I was bunking the class.

This intriguing question originated from Constructors Overloading topic in section Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

Answer 1

The correct answer is (b) constructorName(int x=0, int y=0)

Easiest explanation - For a parameterized constructor to be used as a default constructor, it must have all the default arguments. This makes the constructor to have optional arguments which are not mandatory to be passed.