>
> but although I changed else expresion, Racket sometimes returns same
> warning(but now with #f instead of #).
After you call `select-room`, you'll want to check that the result is an
mlist (instead of #f or #) before calling mcdr.
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Thank you very much,
but although I changed else expresion, Racket sometimes returns same
warning(but now with #f instead of #).
But when I click Run again (sometimes twice or more) it returns what I want.
That´s the strangest thing.
Could it be an error in Racket settings?
I attach my code,
The most literal translation is
#lang racket
(define select-room (lambda (number rooms)
(let loop ((l (mcar rooms)))
(if (not (null? l))
(if (= (mcar(mcar l)) number)
(mcar l)
Thank for your answer,
but how should I change the procedure and ged rid of Racket warning?
I cant figure it out.
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Dne neděle 10. dubna 2016 13:29:43 UTC+2 Joan Martin napsal(a):
> Hello,
> I try to write a programme (a game), where I use lots of mutable lists (named
> environment).Something like this:
> (define environment
> (mcons (mcons (mcons 1 (mcons (mcons 2(mcons 5(mcons 8 '('() ))
>
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