Subject:
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Re: How to read variables from RCX
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Fri, 16 Feb 2001 02:52:36 GMT
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Viewed:
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2078 times
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In lugnet.robotics.rcx.nqc, Dave Baum writes:
> In article <G8qBp6.EEz@lugnet.com>, "Chris Hood"
> <mixer4663@pleasenospam.home.com> wrote:
>
> > It is my understanding that the RCX has 32 "spaces" for variables, I am
> > trying to set variable A or 10 to the value of 100 and then evaluate it
> > in
> > an IF statement. However I am not sure how to read that variable "space"
> > correctly. Here is what I am trying to do in a snippet of code.
> >
> > int A;
> > task main(){
> > if(A == 100){
> > start sometask;
> > }else{
> > start someothertask;
> > }
> >
> >
> > I would think that there would be a certain way to call that variable
> > "space" properly and as I do know that the "spaces" are 0-9 and A-G I
> > don't
> > think that I can call "A" as I am doing above because I initialize "A"
> > but
> > never set it to any value (because I am trying to pass that value to the
> > program) so the IF always evaluates false and runs the else.
> >
> > Your help would be GREATLY appreciated, please respond to my e-mail
> > address
> > below as well as posting your reply.
> >
> > Chris
> > mixer4663@home.com
>
> In general, you don't have control over where the variables get placed.
> If necessary you can take advantage of the fact that globals are
> allocated consecutively starting at location 0, so in the above example,
> A refers to location 0. However, this is pretty risky since I may
> change the allocation algorithm at some point in the future.
>
> Its possible to tell NQC to not use a storage location...
>
> #pragma reserve 0
>
> will reserve location 0 (no NQC variables will ever be assigned there).
> You can then refer directly to storage locations using the @ operator:
>
> // test to see if location 0 contains value 100
> if (@0 == 100)
> {
> ...
> }
>
> Dave
Dave,
First of all thank you very much, using #pragma reserve 10 works great for
me. I would let you know though that although in your programming guide you
tell how to reserve a storage location you do not tell how to access the
reserved location, maybe you can add this to the next version of your
documentation. It would be of great help to us NQC rookies.
Chris
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Message has 1 Reply:
Message is in Reply To:
 | | Re: How to read variables from RCX
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| (...) In general, you don't have control over where the variables get placed. If necessary you can take advantage of the fact that globals are allocated consecutively starting at location 0, so in the above example, A refers to location 0. However, (...) (24 years ago, 14-Feb-01, to lugnet.robotics.rcx.nqc)
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