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algorithm::checkdigits::mxx_004

CheckDigits::MXX_004(3pm)				User Contributed Perl Documentation				 CheckDigits::MXX_004(3pm)

NAME

       CheckDigits::MXX_004 - compute check digits for VAT RN (AT)

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $vat = CheckDigits('ustid_at');

	 if ($vat->is_valid('U13585627')) {
	       # do something
	 }

	 $cn = $vat->complete('U1358562');
	 # $cn = 'U13585627'

	 $cd = $vat->checkdigit('U13585627');
	 # $cd = '7'

	 $bn = $vat->basenumber('U13585627');
	 # $bn = 'U1358562'

DESCRIPTION

   ALGORITHM
       1.  Beginning right all numbers before the check digit are weighted alternatively 1 and 2.

       2.  The total of the digits of all products is computed and then subtracted from 96.

       3.  The check digit is the sum of step 3 taken modulo 10.

   METHODS
       is_valid($number)
	   Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given
	   above.

	   Returns false otherwise,

       complete($number)
	   The check digit for $number is computed and concatenated to the end of $number.

	   Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.

       basenumber($number)
	   Returns the basenumber of $number if $number has a valid check digit.

	   Return '' otherwise.

       checkdigit($number)
	   Returns the checkdigit of $number if $number has a valid check digit.

	   Return '' otherwise.

   EXPORT
       None by default.

AUTHOR

       Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

       perl, CheckDigits, www.pruefziffernberechnung.de.

perl v5.10.0							    2008-05-17						 CheckDigits::MXX_004(3pm)

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