What are abstract classes in C++?

What are abstract classes in C++?

Abstract classes in C++ are classes that cannot be instantiated and are meant to be subclassed. They often contain at least one pure virtual function.

Can you give me an example of an abstract class?

Sure! Here's a simple example:

class Shape {
public:
    virtual void draw() = 0; // Pure virtual function
};

class Circle : public Shape {
public:
    void draw() override {
        // Implementation for drawing a circle
    }
};

What is the purpose of using abstract classes?

The purpose of abstract classes is to provide a common interface for derived classes, ensuring that they implement specific functionalities.

Can abstract classes have member variables?

Yes, abstract classes can have member variables, just like regular classes. They can also have constructors and destructors.