Subject:
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Re: Just some really basic questions...
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Wed, 31 Jan 2001 18:37:45 GMT
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Viewed:
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4857 times
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Bernd Frassek wrote:
> In lugnet.robotics.rcx.nqc, Dean Husby writes:
>
> > Your example did as I have stated. Global variables are global across all • program
> > slots.
>
> Dean,
>
> you are right and meanwhile I could test it.
> However, the definition for the global variables must be in the SAME ORDER
> order for both of the programs.
>
> If you would do this:
>
> SLOT 1:
> int testvar1 = 1;
> int testvar2 = 2;
> int globvar1 = 3;
> int globvar2 = 4;
> task main ()
> {
> SelectProgram (4); // program 4 = slot 5
> }
> SLOT 5:
> int globvar1;
> int globvar2;
> task main () {
> SetUserDisplay (globvar1, 0);
> Wait (100);
> SetUserDisplay (globvar2, 0);
> Wait (100);
> }
>
> your output will be 1 and 2 and not 3 and 4 as one could expect. The reason is
> clear when you look at the compiled programs:
>
> SLOT 1:
> setv var[0], 1
> setv var[1], 2
> setv var[2], 3
> setv var[3], 4
> ...
> prgm 4
>
> SLOT 5:
> ...
> disp 0, var[0]
> wait 100
> disp 0, var[1]
> wait 100
>
> That means, global variables that should be shared between programs in
> different slots must be in the SAME LOCATION and ORDER.
>
> A Note for DAVE BAUM:
> It would be good to make some statements about the above in the NQC
> documentation.
>
> (Note only for oldies like me: this is the same as a "Common Block" in old
> Fortran programming, where values were shared between different main programs
> that were executed consecutively).
>
> Best regards and happy GVS :-)
> Bernd
>
> GVS: Global Variable Sharing
Thank you Frank, I had forgotten about that. Thank you for bringing it up. This
info will save considerable suffering in future!
Dean
--
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Vancouver Lego Club: http://www.akasa.bc.ca/vlc
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Message is in Reply To:
 | | Re: Just some really basic questions...
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| (...) program (...) Dean, you are right and meanwhile I could test it. However, the definition for the global variables must be in the SAME ORDER order for both of the programs. If you would do this: SLOT 1: int testvar1 = 1; int testvar2 = 2; int (...) (26 years ago, 31-Jan-01, to lugnet.robotics.rcx.nqc)
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