[plt-scheme] Question about Intermediate Student

From: Todd O'Bryan (toddobryan at gmail.com)
Date: Thu Apr 9 23:18:17 EDT 2009

Whoops, I had forgotten that that was a book problem. I do it in class
with my students and then have them write geometric-function. (I'll
check to make sure it's not on my website.)

Are you in 4.1.5?

Welcome to DrScheme, version 4.1.5 [3m].
Language: Intermediate Student; memory limit: 128 megabytes.
This program should be tested.
> ((arithmetic-sequence 5 2) 4)
function call: expected a name after an open parenthesis, but found
something else


On Thu, Apr 9, 2009 at 10:45 PM, Carl Eastlund <cce at ccs.neu.edu> wrote:
> Todd,
> Thanks for the question.  I'm happy to answer it, but first, the code
> you've posted looks an awful lot like the solution to a homework
> problem from HtDP -- in fact, one that was assigned recently in a
> course here at Northeastern University.  I have no doubt your
> intentions were innocent, but please do not post complete solutions to
> homework problems on this mailing list.  Students (at any school) may
> not be so noble in their intentions when looking up Scheme on the
> internet.
> On Thu, Apr 9, 2009 at 10:33 PM, Todd O'Bryan <toddobryan at gmail.com> wrote:
>> The problem is that you can pass the result of this function to other
>> functions, but you can't call it.
>> (build-list 5 (arithmetic-sequence 2 3)) --> (list 2 5 8 11 14)
>> but
>> ((arithmetic-sequence 2 3) 0) produces an error.
> I pasted the code you provided and the expression above did not give
> me an error - it produced a value.  I tried it in both the definitions
> window and the interactions window.  What error message are you
> seeing?
> --
> Carl Eastlund

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