Question

what is constructor in c++?

Answer 1

A constructor is a member function of a class that initializes an object (instance) of the class. The constructor has the same name as the class and is called automatically when an object is instantiated.

Answer 2

What @rsmith6559 said. In layman's terms, it is what is called to create an instance of an object.

Answer 3

they are the member fun. of a class which is created automatically within the object of a class created.
it is basically use for initialization.