A derived class object can be assigned to a base class object.

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Quizplus · Accepted Answer

This is known as upcasting, where the derived class object is treated as a base class object. This is allowed because all the members of the derived class are also members of the base class. This is called upcasting and it is allowed in object-oriented programming. The base class object can only access the methods and properties that are defined in the base class, even though the actual object may be of the derived class.

A Derived Class Object Can Be Assigned to a Base