10-02-2010
Quote:
Originally Posted by
puttster
Say I have 3 sets of numbers: 043 5326 90432
and I want to select the digits that all 3 have in common!
so to answer my question 3 is the only digit that all 3 have in common!
Can this be done with 1 command in unix shell? or is it more complicated than I think it is?
I don't want an answer to my question but an idea on how any of you would start this and also I would like help depending on what questions I have!
(a) Remove all digits other than 0 from each number group. If you are left with three 0's (one from each group), then you have your answer.
(b) Repeat step (a) for the remaining 9 digits.
tyler_durden
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LEARN ABOUT DEBIAN
algorithm::checkdigits::m10_004
CheckDigits::M10_004(3pm) User Contributed Perl Documentation CheckDigits::M10_004(3pm)
NAME
CheckDigits::M10_004 - compute check digits for 2aus5, EAN, ILN, ISBN13, NVE
SYNOPSIS
use Algorithm::CheckDigits;
$ean = CheckDigits('ean');
if ($ean->is_valid('7622200004607')) {
# do something
}
$cn = $ean->complete('762220000460');
# $cn = '7622200004607'
$cd = $ean->checkdigit('7622200004607');
# $cd = '7'
$bn = $ean->basenumber('7622200004607');
# $bn = '762220000460'
DESCRIPTION
ALGORITHM
1. Beginning right all numbers are weighted alternatively 1 and 3 (that is the check digit is weighted 1).
2. The sum of all products is computed.
3. The sum of step 3 ist taken modulo 10.
4. The check digit is the difference between 10 and the number from step 3.
To validate the total of the digits of all numbers inclusive check digit taken modulo 10 must be 0.
METHODS
is_valid($number)
Returns true only if $number consists solely of digits, spaces and hyphen and the last digit is a valid check digit according to the
algorithm given above.
Returns false otherwise,
complete($number)
The check digit for $number is computed and concatenated to the end of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits, spaces and hyphen.
basenumber($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.
BUGS AND LIMITATIONS
When invoked as "CheckDigits('isbn13')" the module checks whether the first three digits (the country code) are 978 or 979, the current (as
of 2006) EAN country codes for books. If at any time other EAN country codes for ISBN-13 will be specified and the then responsible
maintainer ignores this in the code, please send a friendly email.
AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de.
perl v5.10.0 2008-05-17 CheckDigits::M10_004(3pm)