Pure virtual function - C++ Class

C++ examples for Class:Virtual Function

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Description

Pure virtual function

Demo Code

#include <iostream>
using namespace std;
class Base// w ww . j av  a  2 s. c om
{
   public:
   virtual void show() = 0;    //pure virtual function
};
class Derv1 : public Base         //derived class 1
{
   public:
   void show()
   { cout << "Derv1\n"; }
};
class Derv2 : public Base         //derived class 2
{
   public:
   void show()
   { cout << "Derv2\n"; }
};
int main()
{
   // Base bad;            //can't make object from abstract class
   Base* arr[2];        //array of pointers to base class
   Derv1 dv1;           //object of derived class 1
   Derv2 dv2;           //object of derived class 2
   arr[0] = &dv1;       //put address of dv1 in array
   arr[1] = &dv2;       //put address of dv2 in array
   arr[0]->show();      //execute show() in both objects
   arr[1]->show();
   return 0;
}

Result


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