Thomas SMETS writes:
> I'm removing charaters from a String which should be numbers.
> I then want to make calculations on these numbers (calculate the ISBN
> number).
(You might want to look into contrib/isbn_issn for an isbn type.)
> Do I have to cast the char into int's before I can do the calulations.
Depends on the calculation. I'd just try to see if it works. When in
doubt add casts.
> Also I looked in the User manual but could not find the modulo function
> where is it ?
5 % 4
mod(5, 4)
--
Peter Eisentraut peter_e@gmx.net http://yi.org/peter-e/