/02-library

Library

  1. Book: title, author

  2. Order: book, reader, date

  3. Reader: name, email, city, street, house

  4. Author: name, biography

  5. Library: books, orders, readers, authors

Write program that determines:

  1. Who often takes the book

  2. What is the most popular book

  3. How many people ordered one of the three most popular books

  4. Save all Library data to file(s)

  5. Get all Library data from file(s)