## RE: st: RE: summing up digits and comparing to a check digit

It's on SSC, as indicated. But I suspect Michael Blasnik has solved your problem directly.

Nick n.j.cox@durham.ac.uk

Lia Orfei > wow the very author - thanks - if only I could find the program! Nick Cox > >-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.

Lia Orfei

> >>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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