Cpp - Inheritance Function Overriding

Introduction

Overriding a function means changing the implementation of a base class function in a derived class.

When you make an object of the derived class, the corresponding function is called.

To override a function, a derived class creates a member function with the same return type and signature as a member function in the base class.

Dog class overrides the speak() member function of the Mammal class, causing Dog objects to say "Woof!" when the function is called.

Demo

#include <iostream> 
class Mammal /*from ww w . j a  v  a  2 s.c o  m*/
{ 
public: 
    // constructors 
    Mammal() { std::cout << "Mammal constructor ...\n"; } 
    ~Mammal() { std::cout << "Mammal destructor ...\n"; } 
   
    // other member functions 
    void speak() const { std::cout << "Mammal sound!\n"; } 
    void sleep() const { std::cout << "Shhh. I'm sleeping.\n"; } 
   
protected: 
    int age; 
    int weight; 
}; 
   
class Dog : public Mammal 
{ 
public: 
    // constructors 
    Dog() { std::cout << "Dog constructor ...\n"; } 
    ~Dog() { std::cout << "Dog destructor ...\n"; } 
   
    // other member functions 
    void wagTail() { std::cout << "Tail wagging ...\n"; } 
    void begForFood() { std::cout << "Begging for food ...\n"; } 
    void speak() const { std::cout << "Woof!\n"; } 
   
private: 
    int breed; 
}; 
   
int main() 
{ 
    Mammal bigAnimal; 
    Dog fido; 
    bigAnimal.speak(); 
    fido.speak(); 
    return 0; 
}

Cpp - Inheritance Function Overriding

Introduction

Demo

Result

Related Topics