W3School TIY Editor

#include <iostream>

#include <string>

using namespace std;

​

// 基类

class Animal {

  public:

    void animalSound() {

      cout << "动物发出声音 \n";

    }

};

​

// 派生类

class Pig : public Animal {

  public:

    void animalSound() {

      cout << "猪说：哼哼 \n";

    }

};

​

// 派生类

class Dog : public Animal {

  public:

    void animalSound() {

      cout << "狗说：汪汪 \n";

    }

};

​

int main() {

  Animal myAnimal;

  Pig myPig;

  Dog myDog;

​

  myAnimal.animalSound();

  myPig.animalSound();

  myDog.animalSound();

  return 0;

}