Passing Arguments to Base Constructors - C++ Class

C++ examples for Class:Constructor

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Description

Passing Arguments to Base Constructors

Demo Code

                                                          
#include <iostream> 
                                                             
enum COLOR { RED, BLUE, WHITE, BLACK, EE, YELLOW }; 
                                                             
class Pet //from w w  w. j av a  2 s .c  o m
{ 
public: 
    // constructors 
    Pet(); 
    Pet(int age); 
    ~Pet(); 
                                                             
    // accessors 
    int getAge() const { return age; } 
    void setAge(int newAge) { age = newAge; } 
    int getWeight() const { return weight; } 
    void setWeight(int newWeight) { weight = newWeight; } 
                                                             
    // other member functions 
    void speak() const { std::cout << "Pet sound!\n"; } 
    void sleep() const { std::cout << "Shhh. I'm sleeping.\n"; } 
                                                             
protected: 
    int age; 
    int weight; 
}; 
                                                             
class Dog : public Pet 
{ 
public: 
    // constructors 
    Dog(); 
    Dog(int age); 
    Dog(int age, int weight); 
    Dog(int age, COLOR color); 
    Dog(int age, int weight, COLOR color); 
    ~Dog(); 
                                                             
    // accessors 
    COLOR getBreed() const { return color; } 
    void setBreed(COLOR newBreed) { color = newBreed; } 
                                                             
    // other member functions 
    void wagTail() { std::cout << "Tail wagging ...\n"; } 
    void begForFood() { std::cout << "Begging for food ...\n"; } 
                                                             
private: 
    COLOR color; 
}; 
                                                             
Pet::Pet(): 
age(1), 
weight(5) 
{ 
    std::cout << "Pet constructor ...\n"; 
} 
                                                             
Pet::Pet(int age): 
age(age), 
weight(5) 
{ 
    std::cout << "Pet(int) constructor ...\n"; 
} 
                                                             
Pet::~Pet() 
{ 
    std::cout << "Pet destructor ...\n"; 
} 
                                                             
Dog::Dog(): 
Pet(), 
color(RED) 
{ 
    std::cout << "Dog constructor ...\n"; 
} 
                                                             
Dog::Dog(int age): 
Pet(age), 
color(RED) 
{ 
    std::cout << "Dog(int) constructor ...\n"; 
} 
                                                             
Dog::Dog(int age, int newWeight): 
Pet(age), 
color(RED) 
{ 
    weight = newWeight; 
    std::cout << "Dog(int, int) constructor ...\n"; 
} 
                                                             
Dog::Dog(int age, int newWeight, COLOR color): 
Pet(age), 
color(color) 
{ 
    weight = newWeight; 
    std::cout << "Dog(int, int, COLOR) constructor ...\n"; 
} 
                                                             
Dog::Dog(int age, COLOR newBreed): 
Pet(age), 
color(newBreed) 
{ 
    std::cout << "Dog(int, COLOR) constructor ...\n"; 
} 
                                                             
Dog::~Dog() 
{ 
    std::cout << "Dog destructor ...\n"; 
} 
                                                           
int main() 
{ 
    Dog fido; 
    Dog rover(5); 
    Dog buster(6, 8); 
    Dog yorkie (3, RED); 
    Dog dobbie (4, 20, EE); 
    fido.speak(); 
    rover.wagTail(); 
    std::cout << "Yorkie is "  
         << yorkie.getAge() << " years old\n"; 
    std::cout << "Dobbie weighs "  
           << dobbie.getWeight() << " pounds\n"; 
    return 0; 
}

Result


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