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check digit

[′chek ‚dij·ət]

(computer science)

A redundant digit used to perform a check.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

check digit

A numeric digit used to ensure that account numbers are entered accurately into the computer. Check digits are computed when the numbers are generated, and they become part of the number, often at the end. When an account number is entered, the data entry procedure recalculates the check digit and compares it. If not equal, the account number is considered invalid. Following is a simple check digit computation:
Starting Number:2  8  5  0  4  8

   1 - Sum digits = 27
   2 - 2 and 7 = 9
   3 - Append to end

  Account number with check digit at end:2  8  5  0  4  8  9

Copyright © 1981-2025 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.

References in periodicals archive ?

A check digit is a single number computed from the other numbers in the ticket number.

These newly developed technologies help solve this issue by enabling key data to be restored by collecting a range of check digit data, which confirms when tampering takes place, then using an optimized combination of error-correcting code technologies that correct communication and memory errors and conventional secret dispersion technologies.

IBAN meant this would not happen because every number would include a country code and a check digit.

The final digit of the universal product code is a check digit that can be computed from the other digits as follows:

The ISWC construction begins with a one-character prefix element followed by a nine-digit work identifier, followed by a one-digit check digit. The letter T was chosen as the prefix element for all ISWCs.

This has been defeated by the scanner developers/carriers by installing Check Digit Routines on the scanned data.

The worker will not be given an order quantity to pick until a match is reached between the working slot that a person is directed to and its check digit.

* 20 New Ticket Number(s): Enter the three-digit validating airline code, form and serial number, and check digit (eleventh number) of the new ticket being issued.

We had surprisingly few problems with typing errors, as indicated by the internal Check Digit Verification of CAS Registry Numbers (17).

However, most modern implementations of barcodes require complicated check digit calculations for error correction that cannot be performed by the fonts themselves.

When a pallet is put away in the correct location, the operator simply keys a check digit into the radio terminal and the warehouse system is instantly updated.


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