[Gambas-devel] gb3: recent revision regarding FOR...NEXT loops and counter variables

[Benoît Minisini]

> On 09/01/2011 07:35 AM, Benoît Minisini wrote:
> >> Holy shit something is seriously wrong with a recent commit. All my
> >> loops are going infinitely by wrapping around to negative values. Guess
> >> no one's using the most recent build or they'd have noticed. Try
> >> something like this in a module with no other code:
> >> 
> >> ' Gambas module file
> >> 
> >> Public Sub Main()
> >> 
> >>     Dim Counter As Short
> >>     
> >>     For Counter = 0 To 32767
> >>     
> >>       Print Counter
> >>     
> >>     Next
> >> 
> >> End
> > 
> > There was a bug fix in loop management.
> > 
> > And your loop must loop indefinitely, because a short value wraps to
> > -32768 after 32767, so the limit is never passed.
> > 
> > The solution is not using a Short as loop variable.
> 
> I understand what it's doing now. The "final" Next overflows the
> counter, making the loop infinite. While that makes sense, something
> doesn't quite smell right. I presume this behavior goes for any integer
> type, such as Byte, Integer, Long, etc.?

Of course.

-- 
Benoît Minisini