Pure Virtual Function And Abstract Class In C++ | Pure Virtual Function And Abstract Class In C++ In Hindi

 

Pure Virtual Function And Abstract Class In C++

Sometimes implementation of all function cannot be provided in a base class because we don’t know the implementation.

A pure virtual function (or abstract function) in C++ is a virtual function for which we don’t have implementation, we only declare it. A pure virtual function is declared by assigning 0 in declaration.

Fig: Pure Virtual Function And Abstract Class In C++

Syntax:

class     base class

{

----

------

public:

virtual return type functionname(argument)=0;

};

Program:

#include<iostream.h>

#include<conio.h>

Class BCA

{

public:

virtual void get()=0;

};

class MCA: public BCA

{

public:

 int a;

void get()

{

cout<<”input one no”;

cin>>a;

cout<<a;

}

};

void main()

{

MCA a2;

a2.get();

getch();

}

Output:

Input one no 76

76