Today's mission involves using multiple Object-Oriented Programming (OOP) principles to tackle complex tasks in C++. When principles like Encapsulation, Abstraction, Polymorphism, and Composition are blended, the resulting code becomes streamlined and easier to manage.

Our goal is to dissect two real-world examples, gaining insights into how these principles can seamlessly orchestrate solutions in C++.

Let's design an online library system using C++ to reinforce our understanding of Encapsulation and Polymorphism. Encapsulation will help us protect the attributes of books, members, and transactions, ensuring they are accessible in a controlled manner. Polymorphism will demonstrate its power by enabling a single interface for different forms, such as digital and print versions of books.

In this code snippet, Encapsulation is clearly observed through the class structures and the controlled access to their attributes. Polymorphism is vividly illustrated by how both DigitalBook and PhysicalBook classes inherit from the Book class but provide their implementations of the get_book_type method. This setup allows objects of DigitalBook and PhysicalBook to be used interchangeably when a book's type needs to be identified, demonstrating polymorphism's capability to work with objects of different classes through a common interface.

• Encapsulation ensures that details about members and books are well-contained within their respective classes.
• Polymorphism showcases flexibility by treating different book types uniformly, making the system more adaptive and scalable.

Next, we'll develop a shape drawing application in C++ to draw various shapes. For this, we'll employ the principles of Abstraction and Composition.

• Abstraction simplifies the complexity associated with drawing different shapes.
• Composition manages composite shapes.

Here's how we translate these principles into our shape drawing application:

This example unveils how Abstraction streamlines the process of drawing different shapes(draw method), and Composition handles complex shapes(vector<Shape*>).

Well done! You combined multiple OOP principles in C++ to respond to complex tasks. By dissecting real-world examples, we understood how these principles found their applications. Now, it's time to put this knowledge to work. Practice fortifies concepts, transforming knowledge into expertise. So, let's get coding!