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st: RE: summing up digits and comparing to a check digit
-pnrcheck- from SSC covers the Swedish case.
In this case, look _inside_ the program
for some ideas. String functions are not
the only way. -mod()- is also useful.
The authors of -pnrcheck- are two Italians
and a Welshman, just who you would expect
to be working on Swedish identifiers.
> 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.
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