1.New Book-> This option is mainly used to enter a new book in the database.

2.New Student->This option is uset to enter the data about a student.

3.Issue->This option is used to issue books by just enterind the student id as well as book id.

4.Return->In this option you return as well as reissue books.
In this you can use the find buutton after entering the student and book id to get issue date and due date to return book.
It will automatically calculate fine for the student.
In case of reissue you have to enter the reissue date and next due date and book is reissued by just pressing reissue button.