CheckDigits::M07_001(3pm)				User Contributed Perl Documentation				 CheckDigits::M07_001(3pm)

NAME

       CheckDigits::M07_001 - compute check digits modulo 7 method 1

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $m001 = CheckDigits('m001');

	 if ($m001->is_valid('1234567892')) {
	       # do something
	 }

	 $cn = $m001->complete('123456789');	# $cn = '1234567892'

	 $cd = $m001->checkdigit('1234567892'); # $cd = '2'

	 $bn = $m001->basenumber('1234567892'); # $bn = '123456789'

DESCRIPTION

   ALGORITHM
       1.  All digits are added.

       2.  All digits at even positions are added.

       3.  The sum of step 1 and 2 is taken modulo 7.

       4.  This is the check digit.

   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 undef if $number does not consist solely of digits.

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

	   Return undef otherwise.

       checkdigit($number)
	   Returns the check digit belonging to $number or undef if $number does not consist solely of digits.

   EXPORT
       None by default.

AUTHOR

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

SEE ALSO

       perl, www.pruefziffernberechnung.de.

perl v5.10.0							    2008-05-17						 CheckDigits::M07_001(3pm)