练习40

#include <iostream>
using namespace std;
enum myColor {
BLACK, WHITE
};
class Mammal {
public:
// constructors
Mammal();
~Mammal();


//accessors
int getAge() const {
return itsAge;
}
void setAge(int age) {
itsAge = age;
}
int getWeight() const {
return itsWeight;
}
void setWeight(int weight) {
itsWeight = weight;
}


//Other methods
void speak() const {
cout << "Mammal sound!\n";
}


protected:
int itsAge;
int itsWeight;
};


class Dog: public Mammal {
public:
Dog();
~Dog();


myColor getColor() const {
return itsColor;
}
void setColor(myColor color) {
itsColor = color;
}


void wagTail() {
cout << "Tail wagging...\n";
}


private:
myColor itsColor;
};


Mammal::Mammal() :
itsAge(1), itsWeight(5) {
cout << "Mammal constructor...\n";
}


Mammal::~Mammal() {
cout << "Mammal destructor...\n";
}


Dog::Dog() :
itsColor(WHITE) {
cout << "Dog constructor...\n";
}


Dog::~Dog() {
cout << "Dog destructor...\n";
}
int main() {
Dog jack;
jack.speak();
jack.wagTail();
cout << " jack is " << jack.getAge() << " years old\n";


return 0;
}