How do virtual functions work in C++?

How do virtual functions work in C++?

Virtual functions in C++ allow you to achieve polymorphism. They enable derived classes to override methods defined 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:

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

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

If you don't use the virtual keyword, the method call will be resolved at compile time, leading to static binding. This means the base class method will be called, even if the object is of a derived class.

How do I override a virtual function in a derived class?

To override a virtual function, simply define a function in the derived class with the same name and signature. For example:

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