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st: Re: summing up digits and comparing to a check digit
I'm not sure I understand the problem -- one of your examples is an 8 digit
number but you say you have 7 digit numbers. Anyway, here is some "highly
advanced programming" (?) :
replace x="0"+x if length(x)==6
make sure to remove any line break that the email puts in the last line.
----- Original Message -----
From: "Lia Orfei" <email@example.com>
Sent: Wednesday, March 15, 2006 9:54 AM
Subject: st: summing up digits and comparing to a check digit
Here is a highly advanced programming challenge for you (!)
I have a variable that contains 7-digit numbers; the first digit is the
remainder of the sum of the last six digits divided by 10 (check digit)
example: 1030332 => 0+3+0+3+3+2=11/10=1+1 => check digit=1
12050457 => 0+5+0+4+5+7=21/10=2+1 => check digit=1
and so on.
Now I want to assess whther the check digit is correct for each entry.
How do I calculate the partial sum of the contents of this variable?
Extra challenge: some of the numbers sum up to 10, 20 etc so the check
digit is actually 0 and it does not appear in the data for some reason
(example 50456 is correct becasue 5+0+4+5+6=20 so the remainder is 0).
Any ideas?? I was thinking about using the string functions.
Thanks a lot
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