How abstract class is related to pure virtual function?
Table of Contents
- 1 How abstract class is related to pure virtual function?
- 2 What happens if a pure virtual function is not redefined in a derived class?
- 3 Is it mandatory to redefine the virtual function in derived class?
- 4 What is the difference between virtual function and pure virtual function explain with the help of program?
- 5 Why do we use pure virtual function in C++?
- 6 Which among the following is an important use of abstract class?
- 7 What is the purpose of pure virtual function in C++?
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.
What happens if a pure virtual function is not redefined in a derived class?
No definition is given in base class. Base class having virtual function can be instantiated i.e. its object can be made. Base class having pure virtual function becomes abstract i.e. it cannot be instantiated. If derived class do not redefine virtual function of base class, then it does not affect compilation.
Is it mandatory to redefine the virtual function in derived class?
Explanation: It is not necessary to redefine the virtual function in the derived class.
Is it legal to have an abstract class with all member functions pure virtual?
Pure Virtual definitions Pure Virtual functions can be given a small definition in the Abstract class, which you want all the derived classes to have. Still you cannot create object of Abstract class. Inline pure virtual definition is Illegal.
Why do we use pure virtual function?
A pure virtual function makes it so the base class can not be instantiated, and the derived classes are forced to define these functions before they can be instantiated. This helps ensure the derived classes do not forget to redefine functions that the base class was expecting them to.
What is the difference between virtual function and pure virtual function explain with the help of program?
A virtual function is a member function in a base class that can be redefined in a derived class. A pure virtual function is a member function in a base class whose declaration is provided in a base class and implemented in a derived class. The classes which are containing virtual functions are not abstract classes.
Why do we use pure virtual function in C++?
Which among the following is an important use of abstract class?
Which among the following is an important use of abstract classes? Explanation: The abstract classes can be used to create a generic, extensible class library that can be used by other programmers.
When a derived class redefine a virtual function it is called?
A class that declares or inherits a virtual function is called a polymorphic class. You redefine a virtual member function, like any member function, in any derived class.
What is pure virtual function why and when it is used?
A pure virtual function is a function that must be overridden in a derived class and need not be defined. A virtual function is declared to be “pure” using the curious =0 syntax. For example: class Base {