Which of the following is true about pure virtual function?

Which of the following is true about pure virtual functions? 1) Their implementation is not provided in a class where they are declared. 2) If a class has a pure virtual function, then the class becomes abstract class and an instance of this class cannot be created.

What is true about pure virtual function Mcq?

Explanation: Pure virtual function is a virtual function which has no definition/implementation in the base class. … Explanation: A pure virtual function does not have a definition corresponding to base class.

What is the pure virtual function?

A pure virtual function or pure virtual method is a virtual function that is required to be implemented by a derived class if the derived class is not abstract. Classes containing pure virtual methods are termed “abstract” and they cannot be instantiated directly.

Which of the following is correct way to declare a pure virtual function?

Discussion Forum
Que.Which one of the following is the correct way to declare a pure virtual function?
b.virtual void Display = 0;
c.virtual void Display(void) = 0;
d.void Display(void) = 0;
Answer:virtual void Display(void) = 0;

What is true about an abstract class having one or more pure virtual functions?

An abstract class is a class in C++ which have at least one pure virtual function. Abstract class can have normal functions and variables along with a pure virtual function. Abstract class cannot be instantiated, but pointers and references of Abstract class type can be created.

Which of the following option is true about virtual base classes?

Which of the following statements about virtual base classes is correct? It is used to provide multiple inheritance. It is used to avoid multiple copies of base class in derived class. It is used to allow multiple copies of base class in a derived class.

What is the correct way to define the function display () as a pure virtual function in?

You declare a pure virtual function by using a pure specifier ( = 0 ) in the declaration of a virtual member function in the class declaration.

What is the correct way to define the function display () as a pure virtual function in C++?

A pure virtual function is declared by assigning 0 in declaration.

Which of the following is correct for virtual function?

Discussion Forum
Que.Which of the following is not correct for virtual function in C++?
b.Virtual function can be static.
c.Virtual function should be accessed using pointers.
d.Virtual function is defined in base class.
Answer:Virtual function can be static.

What is a virtual function What are pure virtual functions write a C++ program that illustrates how run time polymorphism is achieved using pure virtual function?

Virtual Functions and Runtime Polymorphism in C++

Virtual functions in C++ use to create a list of base class pointers and call methods of any of the derived classes without even knowing kind of derived class object. … Runtime polymorphism can be achieved only through a pointer (or reference) of base class type.