How do I use virtual functions in C++?

How do I use virtual functions in C++?

Virtual functions in C++ allow you to achieve polymorphism. They enable derived classes to override methods in a base class.

Can you give me an example of how to declare a virtual function?

Sure! You declare a virtual function in the base class using the keyword 'virtual'. For example: virtual void display();

What happens if I don't use the virtual keyword?

If you don't use the virtual keyword, the function will not be overridden in the derived class, and the base class version will be called.

How do I call a virtual function from a base class pointer?

You can call a virtual function using a base class pointer that points to a derived class object. For example: Base* b = new Derived(); b->display(); This will call the overridden function in the Derived class.