baseoverride.cpp

来自「《24学时精通c++》的光盘内容」· C++ 代码 · 共 46 行

 //Listing 16.5 Overriding a base class method in a derived class
 #include <iostream>
 
 enum BREED { YORKIE, CAIRN, DANDIE, SHETLAND, DOBERMAN, LAB };
 
 class Mammal
 {
 public:
     // constructors
     Mammal() { std::cout << "Mammal constructor...\n"; }
     ~Mammal() { std::cout << "Mammal destructor...\n"; }
 
     //Other methods
     void Speak()const { std::cout << "Mammal sound!\n"; }
     void Sleep()const { std::cout << "shhh. I'm sleeping.\n"; }
 
 protected:
     int itsAge;
     int itsWeight;
 };
 
 class Dog : public Mammal
 {
 public:
     // Constructors
     Dog(){ std::cout << "Dog constructor...\n"; }
     ~Dog(){ std::cout << "Dog destructor...\n"; }
 
     // Other methods
     void WagTail() { std::cout << "Tail wagging...\n"; }
     void BegForFood() { std::cout << "Begging for food...\n"; }
     void Speak()const { std::cout << "Woof!\n"; }
 
 private:
     BREED itsBreed;
 };
 
 int main()
 {
     Mammal bigAnimal;
     Dog fido;
     bigAnimal.Speak();
     fido.Speak();
     return 0;
 }