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Is there a way to open graphic file in newLisp? For example jpeg or gif file? I understand that there is a way to import C libs, but libjpeg, for example, includes work with pointers and I don't know how to make it possible in newLisp.

Thank you fro the answers, that solved the problem.

It doesn't work with passed values.
This won't change the variable.

I have a few questions about destructive functions. Can anybody explain why setf doesn't work with passed values ? It may return correct value, but it doesn't change the variable itself. PS maybe it would be better if I describe full problem: I need to edit branches or / and leafs inside a tree. I w...

Thanks for good answers.

A direct translation of the Scheme code to newLisp might be: ; make-square ; 2011-03-05 ; example ; (set 's1 (make-square 2)) ; (s1 'area) ;result = 4 ; (s1 'perimeter) ;result = 8 ; (s1 'xxx) ;result = "unknown message" error (define (make-square side) (letex (s side) (lambda (msg) (cond ((= msg '...

Thanks for the answers. I read about FOOP. Simply this lambda conception looked interesting for me.

I found an interesting piece of code in scheme, but I failed to make it work in newLisp. Can anybody explain why? (define (make-square side) (lambda (msg) (cond ((eq? msg 'area) (* side side)) ((eq? msg 'perimeter) (* 4 side)) (else (error "unknown message"))))) > (define s1 (make-square 4)) > (s1 '...