virtual_functions.cpp

#include <iostream>

struct Animal
{
  virtual void Voice() = 0;
  /*{
    std::cout << "Oleg kruto!\n";
  }*/
};

struct Dog : Animal
{
  void Voice() override
  {
    std::cout << "Wav!\n";
  }
};

struct Cat : Animal
{
  void Voice() override
  {
    std::cout << "Meow!\n";
  }
};

struct Parrot : Animal
{
  /*void Voice()
  {
    std::cout << "Popka durak!\n";
  }*/
};

int main() 
{
  Cat cat;
  Dog dog;
  Parrot parrot;
  Animal& a1 = cat, &a2 = dog, &a3 = parrot;
  a1.Voice();
  a2.Voice();
  a3.Voice();
  
}