What is the Difference Between Virtual Function and Pure Virtual Function

A virtual function is a member function of base class which can be redefined by derived class. A pure virtual function is a member function of base class whose only declaration is provided in base class and should be defined in derived class otherwise derived class also becomes abstract.

1. What is pure virtual functions?
2. What is pure virtual function give example?
3. How does virtual function differ from function in C++?
4. What do you mean by virtual function?
5. What is virtual function example?
6. How do you create a pure virtual function?
7. What is virtual base class with example?
8. How do you create a virtual function?
9. When would you use a virtual destructor?
10. Which keyword is used to declare virtual functions?
11. Which type of inheritance needs a virtual function?
12. How is inheritance affected by the virtual and pure virtual functions?

What is pure virtual functions?

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.

What is pure virtual function give example?

A pure virtual function is a virtual function in C++ for which we need not to write any function definition and only we have to declare it. It is declared by assigning 0 in the declaration. An abstract class is a class in C++ which have at least one pure virtual function.

How does virtual function differ from function in C++?

Virtual functions ensure that the correct function is called for an object, regardless of the type of reference (or pointer) used for function call. Functions are declared with a virtual keyword in base class. The resolving of function call is done at Run-time.

What do you mean by virtual function?

A virtual function is a member function that you expect to be redefined in derived classes. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class's version of the function.

What is virtual function example?

- A virtual function is a member function that is declared within a base class and redefined by a derived class. When a class containing virtual function is inherited, the derived class redefines the virtual function to suit its own needs. ... - Base class pointer can point to derived class object.

How do you create a pure virtual function?

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

What is virtual base class with example?

Virtual base classes are used in virtual inheritance in a way of preventing multiple “instances” of a given class appearing in an inheritance hierarchy when using multiple inheritances.

How do you create a virtual function?

A C++ virtual function is a member function in the base class that you redefine in a derived class. It is declared using the virtual keyword.
...
Let's see a simple example:

1. #include <iostream>
2. using namespace std;
3. class Base.
4. public:
5. virtual void show() = 0;
6. ;
7. class Derived : public Base.

When would you use a virtual destructor?

Virtual keyword for destructor is necessary when you want different destructors should follow proper order while objects is being deleted through base class pointer.

Which keyword is used to declare virtual functions?

Which keyword is used to declare virtual functions? Explanation: The virtual keyword is used to declare virtual functions. Anonymous keyword is used with classes and have a different meaning. The virtual functions are used to call the intended function of the derived class.

Which type of inheritance needs a virtual function?

Base classes can't inherit what the child has (such as a new function or variable). Virtual functions are simply functions that can be overridden by the child class if the that child class changes the implementation of the virtual function so that the base virtual function isn't called. A is the base class for B,C,D.

How is inheritance affected by the virtual and pure virtual functions?

The main difference between 'virtual function' and 'pure virtual function' is that 'virtual function' has its definition in the base class and also the inheriting derived classes redefine it. The pure virtual function has no definition in the base class, and all the inheriting derived classes has to redefine it.