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

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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