I have implemented an Ada package for handling and checking ISBN’s based on an article by Kjeld Bagger Laursen (
I have not spent much time checking if it works correctly (or on other compilers than GNU/Ada). Please write me if you find errors or problems, or if you have suggestions for improvements.
You can browse the source code on-line.
You can learn about Ada in the
- It might be an idea to add support for ISBN-13.
First published edition.
- Source code (6 kb zip file)