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It won't know where the error is, only that something is wrong. Perhaps this time I misread a digit and enter the ISBN as 9781861973712.
The system would calculate the check digit for 978186197371 as the number 9. The ISBN check digit system is not completely foolproof, and will not catch all such errors, but will trap many.
This post describes a small module written in Haskell that takes a The latter test cases included some decorative spaces and dashes.
For further information on EAN-13 see: Wikipedia - European Article Number: Implementation based on Tests can be found there too */ boolean is Valid Ean(String code) users_gtin=raw_input("enter first seven digits of gtin ") gtin_seven_digits=unicode(users_gtin) if len(gtin_seven_digits) == 7 and gtin_seven_digits.isnumeric(): ck = ((((int(gtin_seven_digits)) (int(gtin_seven_digits)) (int(gtin_seven_digits)) (int(gtin_seven_digits)))*3) ((int(gtin_seven_digits)) (int(gtin_seven_digits)) (int(gtin_seven_digits)))) final_ck = 10-ck if final_ck == 10: final_ck=0 print "Is your check digit",final_ck,"? NET function to evaluate whether a typed or scanned barcode is a valid Global Trade Item Number (UPC or EAN).The last digit of a bar code number is a computer Check Digit which makes sure the bar code is correctly composed.An ISBN-10 control digit is calculated by multiplying each digit with its one-based index and taking the remainder from the integer division by eleven.For example: ISBN: This completes the control digit calculation function.