[gambit-list] newbie question: Little scheme

Alex Queiroz asandroq at gmail.com
Sat Jan 30 17:46:03 EST 2010


Hallo,

On Sat, Jan 30, 2010 at 8:41 PM, joe tex <joetex1 at gmail.com> wrote:
> I am a scheme newbie currently reading "The Little Schemer"
> The book provides the function for atom as follows.
>
> ------- atom.scm----------------
> (define atom?
>  (lambda  (x)
>    (and (not (pair?  x)) (not null? x))))
> --------------------------------
>
> However when I use it with Gambit, it shows the following error message.
> as follows:
>

Change (not null? x) to (not (null? x)).

Cheers,
-- 
-alex
@asandroq
http://www.ventonegro.org/



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