?? list1208.cpp
字號:
//Listing 12.8 Using virtual methods
#include <iostream>
using std::cout;
class Mammal
{
public:
Mammal():itsAge(1) { cout << "Mammal constructor...\n"; }
virtual ~Mammal() { cout << "Mammal destructor...\n"; }
void Move() const { cout << "Mammal move one step\n"; }
virtual void Speak() const { cout << "Mammal speak!\n"; }
protected:
int itsAge;
};
class Dog : public Mammal
{
public:
Dog() { cout << "Dog Constructor...\n"; }
virtual ~Dog() { cout << "Dog destructor...\n"; }
void WagTail() { cout << "Wagging Tail...\n"; }
void Speak()const { cout << "Woof!\n"; }
void Move()const { cout << "Dog moves 5 steps...\n"; }
};
int main()
{
Mammal *pDog = new Dog;
pDog->Move();
pDog->Speak();
return 0;
}
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