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Learning/Knowledge checks/Week 5/Day 24/Check

Module checkpoint

Day 24 · OOP II knowledge check

Answer every question from your current understanding. After submission, compare your reasoning with the explanation and revisit any weak concept.

6 QuestionsOne Answer eachImmediate ScoreDetailed Explanations

Read→Reason→Select→Review

Question 1 of 6Why must a base method be virtual for dynamic dispatch through a base-class handle?

So calls resolve using the declared handle typeIt makes the method callable without an objectSo calls resolve using the actual object type

Question 2 of 6What is the distinction between protected and local class properties?

protected: same package only; local: same file onlylocal: class and subclasses; protected: defining class onlyprotected: class and subclasses; local: defining class only

Question 3 of 6Why must a deep-copy method copy a composed child object rather than just its handle?

A copied handle becomes null once the source is freedChild handles cannot be assigned outside a constructorCopying only the handle shares the nested object

Question 4 of 6What does a static class member represent?

One class-level value shared by all instancesA separate value created for every method callA value visible only inside one object

Question 5 of 6What does $cast check during a downcast?

Run-time type compatibility with the destination handleWhether the two packed vectors have equal bit widthsCompile-time compatibility of the declared handle types

Question 6 of 6Why use a virtual base class or pure virtual method?

To let the base class be constructed directly with newTo define a common contract for derived implementationsTo make every method call resolve at compile time

Review every selection before submitting. You can retry after reading the explanations.

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