check if a string is numeric

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algorithm::checkdigits::m43_001

CheckDigits::M43_001(3pm)				User Contributed Perl Documentation				 CheckDigits::M43_001(3pm)

NAME

       CheckDigits::M43_001 - compute check digits for Code-39

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $c39 = CheckDigits('code_39');

	 if ($c39->is_valid('AB-123K')) {
	       # do something
	 }

	 $cn = $c39->complete('AB-123');
	 # $cn = 'AB-123K'

	 $cd = $c39->checkdigit('AB-123K');
	 # $cd = 'K'

	 $bn = $c39->basenumber('AB-123K');
	 # $bn = 'AB-123'

DESCRIPTION

   ALGORITHM
       1.  After replacing all non numeric letters with their respective values, the sum of all numbers is computers

       2.  The checkdigit is the sum from step 1 taken modulo 43.

   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::M43_001(3pm)

Shell Programming and Scripting