Question

If two classes are defined “Parent” and “Child” then which is the correct type upcast syntax in C++?

(a) Parent *p=child;

(b) Parent *p=*child;

(c) Parent *p=&child;

(d) Parent *p=Child();

The question was asked by my school principal while I was bunking the class.

My question is from Upcasting topic in portion Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

Answer 1

Correct choice is (c) Parent *p=&child;

Easy explanation - The syntax must contain the base class name first. So that the parent class object pointer can be declared. Then the object is assigned with the derived class object with & symbol. & symbol is added to get the address of the derived class object.