[Gambas-user] R: Unending cycle "For...Next" with variable As Byte

[RICHARD WALKER]

Sinclair BASIC on the QL used to have a FOR loop epilogue which could
be used to handle this sort of thing. A simple FOR loop was

FOR index = start TO stop


On 30/09/2012, Jussi Lahtinen <jussi.lahtinen at ...626...> wrote:
> I think all Basics work this way!
>
> Test with any basic:
>
> For ii = 1 to 10
> Next
>
> Print ii
>
> What you expect? I think all basic languages gives 11 as result.
>
> Jussi
>
>
>
>
>
> On Sun, Sep 30, 2012 at 10:14 PM, Kevin Fishburne <
> kevinfishburne at ...1887...> wrote:
>
>> This one bit me a while back and the answer was the same and I confirmed
>> it through testing. Maybe the documentation for For...Next should
>> mention it. I suspect many BASIC dialects don't work this way, which
>> could lead to confusion for new users of GAMBAS. I could be wrong, but I
>> think even GAMBAS used to not work this way, which makes the issue even
>> more confusing. Then again, the root of the issue doesn't really have
>> anything to do with For...Next but in how variables deal with
>> assignments that are out of range.
>>
>> On 09/30/2012 11:40 AM, Jussi Lahtinen wrote:
>> > It is not bug, Richard is right.
>> >
>> > Jussi
>> >
>> >
>> >
>> > On Sun, Sep 30, 2012 at 6:32 PM, Tobias Boege <taboege at ...626...>
>> > wrote:
>> >
>> >> On Sun, 30 Sep 2012, Ru Vuott wrote:
>> >>> ...I have:
>> >>>
>> >>> [Gambas 3]
>> >>> Version=3.3.0
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>> --- Dom 30/9/12, Ru Vuott <vuott at ...325...> ha scritto:
>> >>>
>> >>>> Da: Ru Vuott <vuott at ...325...>
>> >>>> Oggetto: [Gambas-user] Unending cycle "For...Next" with variable As
>> >> Byte
>> >>>> A: gambas-user at lists.sourceforge.net
>> >>>> Data: Domenica 30 settembre 2012, 16:57
>> >>>> Hello,
>> >>>>
>> >>>> maybe I'm in the clouds.... but I don't understand why this
>> >>>> cycle:
>> >>>>
>> >>>> **********
>> >>>> Public Sub Button1_Click()
>> >>>>
>> >>>> ? Dim j As Byte
>> >>>>
>> >>>> ? For j = 0 To 255
>> >>>>
>> >>>> ???Print j
>> >>>>
>> >>>> ? Next
>> >>>>
>> >>>> End
>> >>>> **********
>> >>>>
>> >>>> runs "ad infinitum" !
>> >>>>
>> >>>> Regards
>> >>>> vuott
>> >>>>
>> >> Can confirm that with rev5189. Richard's guess sounds logical. "For
>> >> To"
>> is
>> >> inclusive: [0; 255] and that's everything you can represent with Byte
>> >> width.
>> >> You won't ever detect Byte > 255.
>> >>
>> >>
>>
>> --
>> Kevin Fishburne
>> Eight Virtues
>> www: http://sales.eightvirtues.com
>> e-mail: sales at ...1887...
>> phone: (770) 853-6271
>>
>>
>>
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