CheckDigits::M09_001(3pm)				User Contributed Perl Documentation				 CheckDigits::M09_001(3pm)

NAME

       CheckDigits::M09_001 - compute check digits for Euro notes

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $euro = CheckDigits('euronote');

	 if ($euro->is_valid('X07738250357')) {
	       # do something
	 }

	 $cn = $euro->complete('X0773825035');	   # $cn = 'X07738250357'

	 $cd = $euro->checkdigit('X07738250357'); # $cd = '7'

	 $bn = $euro->basenumber('X07738250357'); # $bn = 'X0773825035'

DESCRIPTION

   ALGORITHM
       1.  Letters are replaced with their position in the alphabet ('A' = 1, ...).

       2.  The total of the digits of all numbers is computed.

       3.  This sum is taken modulo 9.

       4.  The check digit is the difference between 8 and the number of step 3.

       To validate the last digit of the total of the digits of all numbers inclusive check digit must be 8.

   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.

       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::M09_001(3pm)