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; }