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Forum Index : Microcontroller and PC projects : MMBasic - Arrays in subroutines

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panky

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Joined: 02/10/2012
Location: Australia
Posts: 1101
Posted: 08:13pm 03 Oct 2012
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Hi Folks,
New guy here but with reasonable experience with Basic and hardware.
Using a Duinomite Mega running v4 MMBasic to a PC running TerraTerm.
I am trying to code some routines to manipulate arrays but find I can't seem to pass an array variable to a subroutine. I understand that variables passed to subs should be by reference? Code example -

> new
> 1 dim TstArray(5)
> 2 arraypushdown TstArray,6,99
> 3 print TstArray(0)
>
> 10 Sub ArrayPushDown (ArrayName, ArrayElements, NewData)
> 20 Local Ax
>


30 For Ax = ArrayElements-1 to 1 Step -1
> 40 ArrayName(Ax) = ArrayName(Ax-1)
> 50 Next Ax
> 60 ArrayName(0) = NewData
> 70 End Sub
>
> run
[7] 40 ArrayName(Ax) = ArrayName(Ax-1)
Error: Array must be dimensioned first
>

If I change the array name in lines 1 and 2 to the same as that in the subroutine,
it all works OK but this limits the generality of the subroutine. Am I missing something here?

Any help appreciated.
Thanks, Doug.
... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3194
Posted: 09:00pm 03 Oct 2012
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At this time you cannot pass an array to a sub, only a single element of an array (ie, the argument must resolve into a number or string). I must admit that passing an array (by reference) does not sound that hard to implement - something to look into.

Geoff
Geoff Graham - http://geoffg.net
 
panky

Guru

Joined: 02/10/2012
Location: Australia
Posts: 1101
Posted: 07:35pm 04 Oct 2012
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Thanks Geoff, appreciate your quick reply.
Cheers, Doug.
... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
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