Machine coding problems

Everything so far has been vocabulary - objects, relationships, principles, patterns. This module puts it to work on the kind of prompt an interviewer actually hands you: "design a parking lot," "design an elevator system," a paragraph of requirements and forty-five minutes. Each page takes one system end to end - requirements, class model, core flow, code, and the trade-offs a real answer has to defend - so the shape of a good answer becomes a habit, not a one-off.