>>I've done one of these before but it was a long time ago and I've since trailed away from VFP. Basically, I need to calculate a check digit using the MOD9 formula:
>>
>>
>>Check Digit = 9 – (Pro – (Int (Pro / 9) * 9))
>
>Are you saying the formula you need bases the checkdigit on the overall string? That's unusual; typically, you have to look at each character in the string and do something. However, if this is what you need, converting the formula you give directly into VFP should work.
>
>* Assume nPro is the value for which you need the check digit
>nCheckDigit = 9 - (nPro - (INT(nPro/9) * 9))
>
>Tamar


Thanks, I think that's similar to the code I edited in my original post... at least it seems to be calculating the check digit properly with the tests I'm doing.