How to Override a Base Class Method in a Derived Class in C++?
Function overriding is a concept in object-oriented programming languages, in which a function/method of a parent class is redefined in its child class to change its behavior for the objects of the child class. In this article, we are going to learn how to override a base class function in a derived class in C++.
Override Inherited Methods in C++
In C++, you can override a base class function in a derived class by declaring a function with the same signature in the derived class. Also, ensure that the base class function is declared as virtual function to enable dynamic binding.
C++ Program to Override a Base Class Function in a Derived Class
C++
// C++ Program to Override a Base Class Function in a // Derived Class #include <iostream> using namespace std; // Base class Person class Person { public: // Virtual function to greet virtual void greet() { cout << "Person: Hello, there! \n"; } }; // Derived class AngryPerson inheriting from Person class AngryPerson : public Person { public: // Override the greet function to provide a different // greeting void greet() override { cout << "Angry Person: Hello, looser! \n"; } }; // Driver Code int main() { // Create objects of both classes Person p; AngryPerson ap; // Call the greet function for both objects p.greet(); ap.greet(); return 0; } |
Output
Person: Hello, there! Angry Person: Hello, looser!
Note: It is recommended to use the override keyword to make sure that the user have not forgotten to declare the base class version of the function as virtual.