You cannot assign a base class reference to a derived class variable.

Name: You cannot assign a base class reference to a derived class variable.
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Quizplus · Accepted Answer

A base class reference can be assigned to a derived class object, but not the other way around without explicit casting or conversion, because a derived class has all the properties of the base class plus possibly more, but the base class does not automatically have the properties of the derived class.

You Cannot Assign a Base Class Reference to a Derived