What are virtual functions in C++?

What are virtual functions in C++?

Virtual functions are member functions in a base class that you expect to override in derived classes. They enable polymorphism.

How do I declare a virtual function?

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

Can you give me an example of using virtual functions?

Sure! Here's a simple example:

class Base {
public:
    virtual void show() { cout << "Base class"; }
};

class Derived : public Base {
public:
    void show() override { cout << "Derived class"; }
};

Base* b = new Derived();
b->show(); // Outputs: Derived class