[Solved] What must a non-abstract class do if it inherits from an abstract class with abstract methods? - Ans: Implement all abstract methods or be declared abstract itself. | C Sharp (C#)

C Sharp (C#) - Polymorphism and Abstract Classes

What must a non-abstract class do if it inherits from an abstract class with abstract methods?

AImplement all abstract methods or be declared abstract itself.

BIgnore the abstract methods and define new ones.

COnly implement some abstract methods, others are optional.

DOverride only virtual methods, not abstract ones.

Step-by-Step Solution

Solution:

Step 1: Understand inheritance rules for abstract methods
A non-abstract class inheriting from an abstract class must provide implementations for all abstract methods.
Step 2: Analyze options
Implement all abstract methods or be declared abstract itself. correctly states this. The other options are incorrect because abstract methods must be implemented fully.
Final Answer:
Implement all abstract methods or be declared abstract itself. -> Option A
Quick Check:
Non-abstract subclass = implement all abstract methods [OK]

Quick Trick: Non-abstract subclasses must implement all abstract methods [OK]

Common Mistakes:

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