Subject: [CSG111] Re: CSG111 MP5: Exercise 3 Clarification
From: Max Kubyshkin (maximush@ccs.neu.edu)
Date: Sun Mar 05 2006 - 16:23:05 EST
I believe, true-value? comes from different definition for booleans, and
used here instead of expval->boolean. It shouldn't take you much time to
define this datatype. No contracts for datatypes.
Max//
PS: "This code is untested (sorry!), so it may contain bugs."
Wendy wrote:
> Hi,
>
> In statements.scm, what is the function true-value? Or better yet, where is
> it defined, or do we have to define it? If we have to define it, what is
> its contract?
>
> Thanks,
> Wendy
>
> On 3/4/06, Therapon Skotiniotis <skotthe@ccs.neu.edu> wrote:
>> On Sat, Mar 04, 2006 at 02:45:34PM -0500, Wendy wrote:
>>> Hi,
>>>
>>> I am a little confused about what is being asked in number 3. As interp
>> is
>>> provided, I'm assuming the main goal here is to add the grammer. But do
>> I
>>> add to lang, or create a new lang-like file?
>> Add.
>>
>>> If I add to lang, I've noticed
>>> there are a few things missing and few things that will overlap There is
>> no
>>> addition, multiplication, or division in the language for the
>> assignment,
>>> but there is a Exercise 4.22 (its assumed to be in the grammer of
>>> expression). I'm assuming we're ignoring these operatoins as we did last
>>> time.
>> Yes, + * etc. are easy to do. You've already done that before. Just work
>> with -
>>
>>> as for the overlapping, grammatical elements such as if are already
>>> defined as an expression. Are we to modify this definition, thus forcing
>> if
>>> to be a statement and not an expression. Is this correct?
>> Yes. Make any modifications you need so that at the end your interpreter
>> will implement the Statement language.
>>
>> -- Theo
>>
>>
>
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