Validating isbn c
This is a simple class is meant to verify whether a given book ISBN (International Standard Book Number) code is valid. Will perform conversions on valid numbers when possible.
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Its ISBN is 1861972717, but photographs of the book also show its ISBN divided into sections and preceded with the letters "ISBN".
In this book the ISBN appears on the back cover as: Three things to notice are that (a) one book has hyphens to separate parts of the number, while the other has spaces or spaces and a hyphen, and (b) the number of characters in at least the second and third sections varies between the two books, while (c) both books ISBNs have the same number of sections - four.