Warp wrote:
> 
>   rand() is not a function supported inside user-defined functions, it's
> that simple.
> 
>   (While user-defined functions and SDL math expressions might look similar,
> they are completely separate. It can get a bit confusing sometimes.)
> 
Light dawns. Thanks for the explanation. As you can see I wasn't worried
'cos I could work out the work-around.

John
-- 
"Eppur si muove" - Galileo Galilei

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