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Adam you're right, MOD is short for Modulus. I assumed he wanted arithmetic... didn't read the whole email. http://www.antilles.k12.vi.us/math/cryptotut/mod_arithmetic.htm Anyway, I do have a procedure that does the checkdigit for credit cards, but it's ugly. Michael Schutte Work 614-492-7419 email michael_schutte@xxxxxxxxxxxx AGlauser@erbgroup .com Sent by: To rpg400-l-bounces@ RPG programming on the AS400 / midrange.com iSeries <rpg400-l@xxxxxxxxxxxx> cc 04/12/2006 04:31 Subject PM RE: Mod 10 check digit calculation Please respond to RPG programming on the AS400 / iSeries <rpg400-l@midrang e.com> I was also confused (having done math recently and not having used this algorithm before). I was curious and found out that this algorithm is actually called the LUHN algorithm (http://en.wikipedia.org/wiki/Luhn_formula). Bob - I always thought 'mod' was just short for 'modulus'. Hope this helps the other who were confused, Adam Alan wrote on 12/04/2006 04:24:22 PM: > > I realized that there was some misunderstanding, but I was only using the > phraseology that I have been using in the banking and manufacturing > industry, both in the U.S. and the U.K. for the last 30 years. > Hmmmm - just re-read that. 30 YEARS. THAT explains these grey hairs > > Anyway - sorry for any misunderstandings I have caused. > > Alan > > > > "Bob Cozzi" > <cozzi@xxxxxxxxx> > Sent by: To > rpg400-l-bounces@ "'RPG programming on the AS400 / > midrange.com iSeries'" <rpg400-l@xxxxxxxxxxxx> > cc > > 04/12/2006 04:04 Subject > PM RE: Mod 10 check digit calculation > > > Please respond to > RPG programming > on the AS400 / > iSeries > <rpg400-l@midrang > e.com> > > > > > > > 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. > > > -- > 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. > > -- > 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. > ##################################################################################### Attention: The above message and/or attachment(s) is private and confidential and is intended only for the people for which it is addressed. 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