Re: LOGO-L> Reading Lists

[Paul C Dench <Paul.Dench@bigpond.com>]

Kathy it is not entirely clear what you want to do as your procedure works
as it currently is.

If you are thinking of using numbers other than '1' & '0' you could check
to see whether a particular item is a member of a 'numberlist' i.e.

make "numberlist [4 7 9]

tested by 

ifelse memberp :number :numberlist [gate][show [Sorry, wrong number]

Does that help?


At 10:12 AM 7/27/98 +1000, Kathy McAlister wrote:
>Dear All,
>I have watched all the messages flying and am amazed at the quick
>responses and the number and variety of responses.  If possible I would
>like some help.  I am currently learning about Lego and Logo and I am
>having great fun but I have encountered a problem.
>
>I have designed a boom gate and I am attempting to write a procedure
>that would allow the driver to input a number that would automatically
>raise the boom gate.  The boom gate operation is not a problem but I am
>having trouble with interpreting the numbers.
>
>Currently, I have created a list that consists of 1 for a pass and 0 for
>
>a fail.  My procedure requires the processing of the number into its
>list place.  I currently have:
>to startup
>make "datalist [0 1 1 0 1 0 1 0 1 etc]
>end
>
>to barcode :number
>make "number item :number :datalist
>ifelse :number = 1 [gate] [show [Sorry, wrong number]]
>end
>
>The concept is that the barcode procedure reads the placing of that
>number in the datalist.  If that position has been attributed a 1 the
>boom gate procedure will run.  If not a "Sorry" message will appear.
>
>There must be an easier way of doing this.  I would like the procedure
>to be able to determine if a number is an item of the list but I cannot
>work out how to do this.
>
>Any ideas!  I know I am a beginner!
>
>Thanks
>Kathy McAlister
>
>
>
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Paul Dench
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