Tutorials

Pure Virtual Function

Pure virtual function are the functions which does not have function body. The pure virtual function present within any class, called as abstract class.

Syntax:
	virtual return_type function_name(parameter_list)=0;

e.g

	virtual void show()=0;

It treated as abstract class.
e.g: WAP for pure virtual function

#include<conio.h>
#include<iostream.h>
class Number{
     protected:
	    int num;
     public:
	    void set(int n){
	    num=n;
	    }
	    virtual void show()=0;
};
class Hexa:public Number{
     public:
		void show(){
		 cout<<"\n Hexadecimal "<<hex<<num;
		}
};
class Octal:public Number{
     public:
		void show(){
		 cout<<"\n Octal "<<oct<<num;
		}
};
class Decimal:public Number{
     public:
		void show(){
		 cout<<"\n Decimal "<<dec<<num;
		}
};

void main()
{
  clrscr();
  Hexa h;
  Octal o;
  Decimal d;
  h.set(11);
  o.set(8);
  d.set(12);
  h.show();
  o.show();
  d.show();
 getch();
}

O/P

Hexadecimal b
Octal 10
Decimal 12