The author number is mostly represented by four digits. When the same author has more than one book in the same category, 1 2 will be added after the author number to show the difference. At the same time, if a book is divided into several volumes, or has the first volume and the second volume, it will be marked with other symbols.

The design of this system simulates the management content of students' borrowing books in the library, including inquiring books and borrowing books.