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Problem 4 - Entrance Test

What is the purpose of a virtual function in C++?

A. To create a function that is always inlined.B. To allow a derived class to override a function in its base class.C. To create a function that cannot be accessed from outside the class.D. To force the compiler to generate optimized code.

Correct: B

A virtual function in C++ enables polymorphism by allowing a derived class to override a function in its base class. When a virtual function is called through a base class pointer or reference, the actual function executed is determined at runtime based on the object's type, facilitating dynamic dispatch.