An ISBN is a 13-digit International Standard Book Number that is assigned to virtually every book that is published. The ISBN contains values that correspond to the books geographical region/language, publisher, and edition/format. The last digit in an ISBN is a 'check digit' that ensures that the ISBN is valid. Create a program that checks the ISBN that is entered to see if it is valid, meaning it is a ISBN that could be assigned to a book. If it is invalid, it is not an ISBN that could be issued. See the sprite in the project for info on how the ISBN is validated. You can use division or modular arithmetic (mod block) in your calculation. 9780306406157 is a valid ISBN 9780306406156 is not a valid ISBN 9780356426150 is a valid ISBN 9780356436150 is not a valid ISBN
See also https://en.wikipedia.org/wiki/International_Standard_Book_Number#Check_digits https://www.isbn-international.org/sites/default/files/ISBN%20Manual%202012%20-corr.pdf
