Using Virtual Methods : virtual function « Class « C++






  1. C++
  2. Class
  3. virtual function

Using Virtual Methods

  
#include <iostream>
using namespace std;

class Mammal
{
  public:
     Mammal():itsAge(1) { cout << "Mammal constructor..." << endl; }
     virtual ~Mammal() { cout << "Mammal destructor..." << endl; }
     void Move() const { cout << "Mammal move one step" << endl; }
     virtual void Speak() const { cout << "Mammal speak!" << endl; }

  protected:
     int itsAge;
};

class Dog : public Mammal
{
  public:
    Dog() { cout << "Dog Constructor..." << endl; }
    virtual ~Dog() { cout << "Dog destructor..." << endl; }
    void WagTail() { cout << "Wagging Tail..." << endl; }
    void Speak()const { cout << "Woof!" << endl; }
    void Move()const { cout << "Dog moves 5 steps..." << endl; }
};

int main()
{
   Mammal *pDog = new Dog;
   pDog->Move();
   pDog->Speak();

   return 0;
}








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15.Virtual function in three level inheritance
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