实例 C++ 多态性——以不同的方式执行单个操作

#include <iostream>

#include <string>

using namespace std;

​

// Base class

class Animal {

  public:

    void animalSound() {

      cout << "The animal makes a sound \n" ;

    }

};

​

// Derived class

class Pig : public Animal {

  public:

    void animalSound() {

      cout << "The pig says: wee wee \n" ;

    }

};

​

// Derived class

class Dog : public Animal {

  public:

    void animalSound() {

      cout << "The dog says: bow wow \n" ;

    }

};

​

int main() {

  Animal myAnimal;

  Pig myPig;

  Dog myDog;

​

  myAnimal.animalSound();

  myPig.animalSound();

  myDog.animalSound();

  return 0;

}

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