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

 From "Nick Cox" To Subject RE: st: Re: summing up digits and comparing to a check digit Date Wed, 15 Mar 2006 15:56:27 -0000

```gen x = string(myvar, "%07.0f")

gets you there in one.

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

Austin Nichols

> I agree wholeheartedly with Michael Blasnik's opening caveat--was your
> example 12050457 => 0+5+0+4+5+7=21/10=2+1 => check digit=1 supposed to
> be 1050457 => 0+5+0+4+5+7=21/10=2+1 => check digit=1 by any chance?
>
> As for his solution, it works well except when digits may be fewer
> than 6 digits when turned into strings--I would replace his second
> line with
>  replace x=substr("0000000",1,7-length(x))+x
> to pad numbers out to y digits with leading zeros, and then
> add another line
>  assert length(x)==7
> to make sure there are no odd cases.
>
> . li m x c, noo clean
>
>       myvar         x   check
>      105059   0105059       0
>        2459   0002459       0
>     7102059   7102059       7
>
> On 3/15/06, Michael Blasnik <michael.blasnik@verizon.net> wrote:
> > 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" (?) :
> >
> > gen x=string(myvar)
> > replace x="0"+x if length(x)==6
> > gen
> >
> check=mod(real(substr(x,2,1))+real(substr(x,3,1))+real(substr(
> x,4,1))+real(substr(x,5,1))+real(substr(x,6,1))+real(substr(x,
> 7,1)),10)
> >
> > make sure to remove any line break that the email puts in
> the last line.

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