Re: Mod 10 check digit calculation

[Jerry Adams <jerry@xxxxxxxxxxxxxxx>]

Also called Modulo 10 and 11.  However "Mod 10" and "Mod 11" are the 
common terms;  if you google either one, you'll get a list of pages 
showing how to derive the check digit, as will googling (is that in the 
OED yet?) "Modulus 10".


Aside from bank transactions, I haven't seen it used these days.  In 
keypunch days gone by, though, it was heavily used (I preferred the Mod 
11) to help prevent data entry errors.  And was referred to then as Mod 11.


But I learned something new today, too.  Didn't know "mod" meant 
"remainder".  My (decidedly abridged) dictionary only lists "mod" as 
short for "modern". 


Mostly I'm curious why Alan would need a process that would work over a 
varying size field.  Typically check digits are used on fixed length 
things, such as item number, account numbers, etc., which have fixed 
lengths.



        * Jerry C. Adams
*IBM System i Programmer/Analyst
B&W Wholesale Distributors, Inc.* *
voice
        615.995.7024
fax
        615.995.1201
email
        jerry@xxxxxxxxxxxxxxx <mailto:jerry@xxxxxxxxxxxxxxx>



Bob Cozzi wrote:

> Maybe if you said MODULUS instead of MOD, people would realize that you mean
> Modulus in instead of "mod" which means "remainder"
>
> -Bob Cozzi
> www.RPGxTools.com
> RPG xTools - Enjoy programming again.
>
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On
> Behalf Of Alan Shore
> Sent: Wednesday, April 12, 2006 2:18 PM
> To: RPG programming on the AS400 / iSeries
> Subject: Re: Mod 10 check digit calculation
>
>
> Hi Michael
> Mod 10 check digit calculation is where you start with a number, lets say
> 1234567890. Each of the digits is then multiplied by either 1 or 2
> depending upon its position, with the low-end position being multiplied by
> 2, then the next position to the left, being multiplied by 1, then the next
> position to the left, being multiplied by 2,  then the next position to the
> left, being multiplied by 1, etc.
> For this example 1234567890 becomes
> 1 x 1 = 1
> 2 x 2 = 4
> 3 x 1 = 3
> 4 x 2 = 8
> 5 x 1 = 5
> 6 x 2 = 12
> 7 x 1 = 7
> 8 x 2 = 16
> 9 x 1 = 9
> 0 x 2 = 0
> These answers are then accumulated, in this instance 1 + 4 + 3 + 8 + 5 + 12
> + 7 + 16 + 9 + 0 = 65
> The last digit of this answer (5 of 65) is then subtracted from 10, giving
> the answer 5
> Therefore the check digit for the number 1234567890 is 5
> This is how the check digit for a bank account number is calculated.
>
> I quickly wrote this down, and I'm pretty sure this is the correct way to
> do the Mod 10 check digit calculation.
>
> Again, if anyone can help, much appreciated
>
>
>
> Alan Shore
>
> NBTY, Inc
> (631) 244-2000 ext. 5019
> AShore@xxxxxxxx
>
>
>
>                                                                           
>             Michael_Schutte@b                                             
>             obevans.com                                                   
>             Sent by:                                                   To 
>             rpg400-l-bounces@         RPG programming on the AS400 /      
>             midrange.com              iSeries <rpg400-l@xxxxxxxxxxxx>     
>                                                                        cc 
>                                                                           
>             04/12/2006 03:04                                      Subject 
>             PM                        Re: Mod 10 check digit calculation  
>                                                                           
>                                                                           
>             Please respond to                                             
>              RPG programming                                              
>              on the AS400 /                                               
>                  iSeries                                                  
>             <rpg400-l@midrang                                             
>                  e.com>                                                   
>                                                                           
>                                                                           
>
>
>
>
> You want a mod 10 calculation of a number right?
>
>
> 11 mod 10 = 1
>
> %Rem(11:10) = 1
>
> Am I missing something?
>
> Michael Schutte
> Work 614-492-7419
> email  michael_schutte@xxxxxxxxxxxx
>
> --
> This is the RPG programming on the AS400 / iSeries (RPG400-L) mailing list
> To post a message email: RPG400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
> or email: RPG400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/rpg400-l.
>
>
>