C++ Polymorphism and Virtual Functions Quiz

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Questions and Answers

Which keyword is used in C++ to implement polymorphism?

override
dynamic
static
virtual (correct)

What is the purpose of virtual functions in C++?

To allow a base class to override a derived class function
To prevent a derived class from modifying a base class function
To allow a derived class to override a base class function (correct)
To enforce encapsulation in a class hierarchy

What is polymorphism in C++?

The ability of a function to return different types
The ability of objects of different classes to be treated as if they were objects of the same class (correct)
The ability of a class to have multiple constructors
The ability of a function to take arguments of different types

Which of the following statements about virtual functions in C++ is true?

Virtual functions are resolved at runtime based on the dynamic type of the object (C) Signup and view all the answers

Which of the following is NOT a characteristic of polymorphism in C++?

It allows objects of different types to be treated as if they are of the same type (D) Signup and view all the answers

Which of the following is a disadvantage of using virtual functions in C++?

They can introduce performance overhead due to dynamic dispatch (C) Signup and view all the answers

Study Notes

Polymorphism in C++

Keyword for Polymorphism: The virtual keyword is used in C++ to implement polymorphism.
Purpose of Virtual Functions: Virtual functions in C++ allow for runtime polymorphism, enabling the correct function to be called based on the object's type, rather than the reference or pointer type.

Virtual Functions

True Statement: A true statement about virtual functions in C++ is that they can be overridden by derived classes.
Not a Characteristic of Polymorphism: Polymorphism is not limited to inheritance; it can also be achieved through function overloading and operator overloading.

Disadvantages of Virtual Functions

Disadvantage: One disadvantage of using virtual functions in C++ is that they can result in slower performance due to the overhead of dynamic dispatch.

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Description

Test your knowledge of C++ polymorphism and virtual functions with this quiz! Learn how to implement polymorphism using the correct keyword in C++, and understand the importance of virtual functions in achieving this. Challenge yourself to define polymorphism in C++ and demonstrate your understanding of this fundamental programming concept. This quiz is perfect for anyone looking to enhance their C++ skills and advance their programming knowledge.