FileMaker Pro Custom Functions

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Verhoeff ( numericString ; index ; checkSum )

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Michael Horak, *COMMENT Visual Realisation
http://comment.cjb.net/

Returns the Verhoeff dihedral check digit of numericString. Use this function to verify a numeric string protected by a Verhoeff check digit, or to generate the correct Verhoeff check digit for a given numeric string.

Description:

Returns the Verhoeff dihedral check digit of numericString. Use this function to verify a numeric string protected by a Verhoeff check digit, or to generate the correct Verhoeff check digit for a given numeric string.

For more information about the Verhoeff algorithm, see:
http://en.wikipedia.org/wiki/Verhoeff_algorithm



EXAMPLES OF CALLING THE FUNCTION

1. To extract the check digit from a string in Input field:

Verhoeff ( Input ; 0 ; 0 )

A result of zero (0) indicates a valid entry; any other result indicates a data entry error.


2. To validate an entry in Input field:

not Verhoeff ( Input ; 0 ; 0 )


3. To generate a check digit for a string in Input field:

Middle ( "0432156789" ; Verhoeff ( Input & "0" ; 0 ; 0 ) + 1 ; 1 )


4. To append a check digit to a string in Input field:

Input & Middle ( "0432156789" ; Verhoeff ( Input & "0" ; 0 ; 0 ) + 1 ; 1 )

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

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