Virtual Functions

#include <iostream>

using namespace std;

 class Animals{

   public :

     virtual void speak(){

      cout<<"Animals speak random";

    }

};

 

class Dog: public Animals{

  public:

      void speak(){

      cout<<"Dogs woof";

    }

};

 

int main()

{

  Animals *a;

  Dog d;

 

  a = &d;

 

  a->speak();

}

 

Output:

 //without virtual speak()

 Animals speak random

 //with virtual speak()

 Dog woof