Bird
Raised Fist0

Identify the error in this code snippet:

medium📝 Debug Q7 of Q15
C Sharp (C#) - Inheritance
Identify the error in this code snippet:
sealed class BaseClass {
    public virtual void Execute() { }
}
class DerivedClass : BaseClass {
    public override void Execute() { }
}
ACannot declare a virtual method in a sealed class
BNo error, code is valid
COverride method must be sealed
DCannot inherit from a sealed class
Step-by-Step Solution
Solution:
  1. Step 1: Understand sealed class behavior

    A sealed class cannot be inherited.
  2. Step 2: Check inheritance in code

    'DerivedClass' inherits from 'BaseClass' which is sealed, causing a compile-time error.
  3. Final Answer:

    Cannot inherit from a sealed class -> Option D
  4. Quick Check:

    Sealed classes block inheritance [OK]
Quick Trick: Sealed classes cannot be base classes [OK]
Common Mistakes:
MISTAKES
  • Thinking virtual methods disallow sealing
  • Assuming override must be sealed
  • Believing sealed classes allow inheritance

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