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c++ 在派生类重载的构造函数

2012-11-26 作者：程序猿style举报

[c++]代码库

#include <iostream>
using namespace std;
 
enum BREED {
    GOLDEN, CAIRN, DANDIE, SHETLAND, DOBERMAN, LAB
};
 
class Mammal {
public:
    // constructors
    Mammal();
    Mammal(int age);
    ~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";
    }
    void Sleep() const {
        cout << "shhh. I'm sleeping.\n";
    }
 
protected:
    int itsAge;
    int itsWeight;
};
 
class Dog: public Mammal {
public:
 
    // Constructors
    Dog();
    Dog(int age);
    Dog(int age, int weight);
    Dog(int age, BREED breed);
    Dog(int age, int weight, BREED breed);
    ~Dog();
 
    // Accessors
    BREED GetBreed() const {
        return itsBreed;
    }
    void SetBreed(BREED breed) {
        itsBreed = breed;
    }
 
    // Other methods
    void WagTail() const {
        cout << "Tail wagging...\n";
    }
    void BegForFood() const {
        cout << "Begging for food...\n";
    }
 
private:
    BREED itsBreed;
};
 
Mammal::Mammal() :
        itsAge(1), itsWeight(5) {
    cout << "Mammal constructor..." << endl;
}
 
Mammal::Mammal(int age) :
        itsAge(age), itsWeight(5) {
    cout << "Mammal(int) constructor..." << endl;
}
 
Mammal::~Mammal() {
    cout << "Mammal destructor..." << endl;
}
 
Dog::Dog() :
        Mammal(), itsBreed(GOLDEN) {
    cout << "Dog constructor..." << endl;
}
 
Dog::Dog(int age) :
        Mammal(age), itsBreed(GOLDEN) {
    cout << "Dog(int) constructor..." << endl;
}
 
Dog::Dog(int age, int weight) :
        Mammal(age), itsBreed(GOLDEN) {
    itsWeight = weight;
    cout << "Dog(int, int) constructor..." << endl;
}
 
Dog::Dog(int age, int weight, BREED breed) :
        Mammal(age), itsBreed(breed) {
    itsWeight = weight;
    cout << "Dog(int, int, BREED) constructor..." << endl;
}
 
Dog::Dog(int age, BREED breed) :
        Mammal(age), itsBreed(breed) {
    cout << "Dog(int, BREED) constructor..." << endl;
}
 
Dog::~Dog() {
    cout << "Dog destructor..." << endl;
}
int main() {
    Dog Fido;
    Dog rover(5);
    Dog buster(6, 8);
    Dog yorkie(3, GOLDEN);
    Dog dobbie(4, 20, DOBERMAN);
    Fido.Speak();
    rover.WagTail();
    cout << "Yorkie is " << yorkie.GetAge() << " years old" << endl;
    cout << "Dobbie weighs ";
    cout << dobbie.GetWeight() << " pounds" << endl;
    return 0;
}

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c++ 在派生类重载的构造函数

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