How do I use virtual functions in C++?

What are virtual functions in C++?

Virtual functions in C++ are member functions in a base class that you expect to override in derived classes.

How do I declare a virtual function?

You declare a virtual function by using the keyword 'virtual' before the function's declaration in the base class.

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 show function called.";
    }
};

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

In this example, the show function is virtual in the Base class and overridden in the Derived class.

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

If you don't use the virtual keyword, the function call will be resolved at compile time, leading to static binding instead of dynamic binding.