On Wed, May 18, 2011 at 5:50 PM, Todd Dobmeyer wrote:
>
> As far as Marco's comments earlier, I should have one function to handle
> parsing the list, and upon finding an expression, pass it to the procedure
> that handles expressions instead of trying to handle it all in the same
> procedure. Thi
Thanks for this explanation. I had not seen this error before as I am
new to Scheme. I think I understand what it is saying now. With the
double ()s it assumes the inner set is a procedure.
I am sorry my code looks so poorly, I have been doing C/C++ almost
exclusively for 10 years and I get co
On Tue, May 17, 2011 at 8:03 PM, Todd Dobmeyer wrote:
> I am taking a class at Wright State University and we are working on problem
> 3.27 from the EOPL 2nd Edition
Have you seen the error message before, and do you know what it means?
Here's an example of a program that generates a similar e
Todd,
In addition to Matthias' observations:
> (define free-vars-list
> (lambda (body)
>(
> (if (list? body) (append (free-vars-list (car body)) (free-vars-list
> (cdr body)))
> (cases expression body
> ;; When we have a var-exp, return the
Todd D:
1. This code must be the worst formatted Racket code I have seen in a long
time. Please read EOPL and follow its example.
2. Next, when DrRacket tells you that a particular sub-expression in your
program raised an error, please -- pretty please -- pay attention. I removed
the superf
Todd
Thanks, you are definitely making me think, but I don't see what would
be wrong with what I am trying. The first thing I tried was to remove
free-vars and just call free-vars-list directly and change the case of
(var-exp (id) id)
to
(var-exp (id) (list id)) ;; in this example id == x
s
I apologize in advance for not actually reading through your code
beyond the point where it began using constructs that I'm not familiar
with, but I will give some advice that may or may not be helpful.
You're trying to return '(x). What you're actually returning is
(x)--an application of the valu
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