Project: ISBN-10 Check
The ISBN-10 number used to uniquely identify a book published before 2007 utilizes a check digit in its last place to catch data entry errors. Write a program that checks an ISBN-10 number and prints whether or not it is a valid number.
See [[International_Standard_Book_Number|International Standard Book Number]]
Output
$ perl ISBN10Check.pl
0-7475-3269-9 is valid