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Multilevel Inheritance (C++)

Definition

Multilevel inheritance means a class derives from another derived class.

Example chain:

  • Animal (base)
  • Mammal : Animal
  • Dog : Mammal

So Dog gets members from both Mammal and Animal.

Interview Quick Line

"In multilevel inheritance, inheritance happens in levels. A derived class can indirectly inherit base behavior through an intermediate class."

Minimal Example Flow

  • dog.eat() from Animal
  • dog.walk() from Mammal
  • dog.bark() from Dog

Caution

Use multilevel inheritance when relationship is truly hierarchical. If hierarchy grows too deep, readability and maintenance become harder.

5-Year Interview Perspective

  • Keep hierarchy depth small; deep trees are hard to refactor safely.
  • Prefer composition when features vary orthogonally.
  • If you must keep hierarchy, document responsibilities per layer clearly.