# check digit

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## check digit

[′chek ‚dij·ət]
(computer science)
A redundant digit used to perform a check.

## check digit

A numeric digit used to ensure that account numbers are entered accurately into the computer. Using a formula, a digit is calculated from each new account number, which is then made part of that number, either at the end, the beginning or somewhere in the middle of the number.

When an account number with the check digit is entered, the data entry program recalculates the check digit and compares it to the check digit entered. If the digits are not equal, the account number is considered invalid.
References in periodicals archive ?
If the last digit of the result is 0, then the check digit is 0.
The computed check digit must equal the initial check digit from step 1.
The most obvious example was when several respondents indicated that their products used check digits and/or encryption to ensure the accuracy and safety of data.
Galljan of the University of Minnesota at Duluth has studied the various methods used to generate check digits in commercial situations.
Bar code length was particularly confusing because our code consisted of six digits and a zero, which printed because there was no check digit.
l learned from a telephone call to Coulter's technical service that the instrument would not recognize the bar code without a check digit.
By omitting both check digits and hash totals controls, these accounting packages are grossly deficient in validating account identifiers.
Bound on Parity Check Digits for the Linear Euclidean Weight Codes
L] or less require more parity check digits in comparison to codes which correct open loop bursts of length b or less with Lee weight [w.
Additionally, it appends records with Carrier Route, Delivery Point Bar Codes (DPBC), Line Of Travel (LOT) codes and check digits, creates Postal Form 3553, and also enhances records with geocode data at the address and ZIP+4 level, including latitude/longitude and other important postal information.
The Azalea User Function Library (UFL) makes bar code printing foolproof because it handles all of the necessary error checking, start and stop bars, check digits, font mapping, etc.
The entry module allows quick set-up of validation edits such as date ranges, incorrect zip codes, and check digits.

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