Question

If class C inherits class B and class B inherits class A ________________

(a) Class C object can be upcasted to object of class B only

(b) Class C object can be upcasted to object of class A only

(c) Class C object can be upcasted to object of either class A or B

(d) Class C object can’t be upcasted

This question was addressed to me in a national level competition.

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

Answer 1

Right option is (c) Class C object can be upcasted to object of either class A or B

The explanation is: Both class A and B are parent classes of class C. Class C object hence can be upcasted to any of those class objects. It is not compulsory to upcast to nearest parent.