Question

Why is downcasting possible in any language?

(a) Because inheritance follows has-a relationship

(b) Because inheritance follows is-a relationship

(c) Because inheritance doesn’t follow any relationship

(d) Because inheritance is not involved in casting

I had been asked this question in homework.

My doubt stems from Downcasting topic in section Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

Answer 1

Right option is (b) Because inheritance follows is-a relationship

For explanation: The downcasting is possible because the classes in inheritance follow is-a relationship. Hence the derived class is a base class. Which in turn make the downcasting possible.