This works for me:
(define atom? (lambda (arg1)
(and (not (pair? arg1))
(not (null? arg1)))))
On Mar 3, 2015, at 3:16 PM, Rufus <rlagg...@mail.com> wrote:
> On page 10 of TLS there is a note defining the "atom?" function for the
> reader to use w/Lisp or Scheme. The definition for Scheme (which is the
> most likely one to use for DrR) does not work. To fix one must remove
> the parens that open at the "and". Apparently the DrR
> compiler/interpreter sees them as an attempt to invoke a function and
> that's not correct here. I don't know if other Lisp versions would find
> the code in the book correct.
>
> In the text below XXX shows where I removed a set of parens to make the
> function work.
>
> (define atom? (lambda (arg1)
> XXX and (not (pair? arg1))
> (not (null? arg1))
> XXX
> )
> )
>
>
> Rufus
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