Explain pure virtual functions, C/C++ Programming

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Pure Virtual Functions

An abstract class is one, which is used just for deriving some other classes. No object of this class is declared and used in the program. Likewise, there are pure virtual functions which themselves won't be used. Consider the above example with some changes.

class Shape

{

public :

virtual void print() = 0; // Pure virtual

function

};

class Triangle : public Shape

{

public :

void print()

{

cout << " I am a Triangle " << endl;

}

};

class Circle : public Shape

{

public :

void print()

{

cout << " I am a Circle " << endl;

}

};

void main()

{

Shape S;

Triangle T;

Circle C;

Shape *ptr;

ptr = &T;

ptr -> print();

ptr = &C;

ptr -> print();

}

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