Re: LOGO-L> P's?

[Michael Tempel <michaelt@media.mit.edu>]

At 12:29 AM +0300 3/29/98, deer@y.net.ye wrote:
>Hi,
>
>In MEMBERP, EQUALP, EMPTYP, NUMBERP etc., what does the "P" stand for?
>

Predicate.

These procedures report TRUE or FALSE

?SHOW MEMBERP "A [A B C]
TRUE
?SHOW MEMBERP "A [C D E]
FALSE

They are ususally used as inputs to IF

IF EQUALP POS [0 0] [SHOW [WE'RE HOME!]]


In many versions of Logo ? is used instead of P so we have MEMBER?, EQUAL?,
EMPTY?, NUMBER? etc.

-Michael


--------------------------------------------------------
Michael Tempel                    tel: 212 579 8028
Logo Foundation                   fax: 212 579 8013
250 West 85th Street              michaelt@media.mit.edu
New York  NY 10024
http://el.www.media.mit.edu/logo-foundation/


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