On Wed, Dec 22, 2010 at 2:04 PM, Robby Findler
wrote:
> FWIW, if you were in my class, that solution would get few points. You
> may have noticed people asking you about the design recipe in this
> thread. That is a reference to this book that you might find useful:
>
> http://www.htdp.org/
>
> R
While you got it working, you are over complicating the process.
First you defined that variables, that's fine
(define tax-rate .15)
(define pay-rate 12)
The function net-pay only needs one input, the amount of hours you are working.
With the defined pay-rate and tax-rate, how would you determi
FWIW, if you were in my class, that solution would get few points. You
may have noticed people asking you about the design recipe in this
thread. That is a reference to this book that you might find useful:
http://www.htdp.org/
Robby
On Tue, Dec 21, 2010 at 8:49 PM, Sayth Renshaw wrote:
>
>
>
On Wed, Dec 22, 2010 at 1:19 PM, Sayth Renshaw wrote:
>
>
> On Wed, Dec 22, 2010 at 1:02 PM, Danny Yoo wrote:
>
>> >> (define (netpay gross tax-rate)
>> >>(-(gross)(* gross tax-rate)))
>> >>
>> >> So I expect the function to calculate as
>> >>
>> >> = (-(240)(* 240 0.15)
>> >> = ( - 240 36)
On Wed, Dec 22, 2010 at 1:02 PM, Danny Yoo wrote:
> >> (define (netpay gross tax-rate)
> >>(-(gross)(* gross tax-rate)))
> >>
> >> So I expect the function to calculate as
> >>
> >> = (-(240)(* 240 0.15)
> >> = ( - 240 36)
> >> = 204
>
>
> Just to be more careful: when you're showing the cal
>> (define (netpay gross tax-rate)
>> (-(gross)(* gross tax-rate)))
>>
>> So I expect the function to calculate as
>>
>> = (-(240)(* 240 0.15)
>> = ( - 240 36)
>> = 204
Just to be more careful: when you're showing the calculation, make
sure to include the use of the function:
(netpay 24
On Wed, Dec 22, 2010 at 11:54 AM, Sayth Renshaw wrote:
>
>
> On Wed, Dec 22, 2010 at 11:39 AM, Sam Griff wrote:
>
>>
>> You need to start over and slow down because you are getting the basic
>> Scheme syntax wrong.
>> The gross pay function is already given:
>> (define (wage h)
>> (* 12 h))
>>
>
You need to start over and slow down because you are getting the basic
Scheme syntax wrong.
The gross pay function is already given:
(define (wage h)
(* 12 h))
You could modify it according to the previous suggestions to make it more
readable:
; By convention constants are named in upper case
(d
> I am following the book again and your examples but i am rewriting examples
> so I am learning it.
>
> I came to this as a solution based on feeedback but it is erroring on the
> word gross as part of my netpay function. Do i need to define the gross
> function in my netpay function?
>
> (define
On 12/21/2010 05:29 PM, Danny Yoo wrote:
> On Tue, Dec 21, 2010 at 3:57 PM, Niitsuma Hirotaka
> wrote:
>> I try to run this code on racket
>>
>> http://www.daniweb.com/forums/thread277930.html
>>
>> After little modify I enables run this code on swindle.
>> But when I chose language racket, this c
If you change from #lang racket to #lang mzscheme your program will work.
I'm pretty sure the issue is that eopl was defined in terms of the
'mzscheme' language where `cond' checks for `else' symbolically. The
`else' you are using is from the 'racket' language where its defined as
a syntactic tran
On Tue, Dec 21, 2010 at 3:57 PM, Niitsuma Hirotaka
wrote:
> I try to run this code on racket
>
> http://www.daniweb.com/forums/thread277930.html
>
> After little modify I enables run this code on swindle.
> But when I chose language racket, this code cause error
>
> else: not allowed as an express
I try to run this code on racket
http://www.daniweb.com/forums/thread277930.html
After little modify I enables run this code on swindle.
But when I chose language racket, this code cause error
else: not allowed as an expression in: else
flowing is the modified code
-
On Wed, Dec 22, 2010 at 9:43 AM, Sayth Renshaw wrote:
>
>
> On Wed, Dec 22, 2010 at 2:04 AM, Stephen Bloch wrote:
>
>>
>> On Dec 21, 2010, at 6:50 AM, Sayth Renshaw wrote:
>>
>> > Doing the netpay of employee tax = 0.15 and pay = hrs *12. From the
>> beginner tutorial. I see two ways a simple and
On Wed, Dec 22, 2010 at 2:04 AM, Stephen Bloch wrote:
>
> On Dec 21, 2010, at 6:50 AM, Sayth Renshaw wrote:
>
> > Doing the netpay of employee tax = 0.15 and pay = hrs *12. From the
> beginner tutorial. I see two ways a simple and a hard way but neither work.
> >
> > Hard way
> >
> > (define (ho
Jon Rafkind wrote at 12/21/2010 03:25 PM:
So what does COST and COST-GCMS mean? And what does it mean when they are
negative?
As the documentation implies, only the "RUN" and "RUN-GCMS" numbers are
very meaningful in this version. They are, respectively, "how many ms
did the iterations t
So what does COST and COST-GCMS mean? And what does it mean when they
are negative?
SHOOTOUT-EXPRESSION 1:
(va "aaa")
SHOOTOUT-TIMING (RUN 277, RUN-GCMS 8, COST -121, COST-GCMS -344,
CLEANUP-DIFF -398.0)
On 12/21/2010 01:19 PM, Neil Van Dyke wrote:
> I just released "shootout", a simple little to
I just released "shootout", a simple little tool that's sometimes
helpful for quickly comparing the performance of two or more expressions.
Don't read too much into the numbers.
http://www.neilvandyke.org/racket-shootout/
_
For list-related admi
I am trying to implement an is-equal? function like this:
;; is-equal? : the-obj -> boolean
(define/public (is-equal? another-obj)
(andmap (λ (field-name)
(equal? (get-field field-name another-obj)
field-name))
(field-names this
On Dec 21, 2010, at 6:50 AM, Sayth Renshaw wrote:
> Doing the netpay of employee tax = 0.15 and pay = hrs *12. From the beginner
> tutorial. I see two ways a simple and a hard way but neither work.
>
> Hard way
>
> (define (hours h)
> (h : number?))
> (define (tax t)
> (= t 0.15))
> (defi
Noel Welsh wrote at 12/21/2010 09:06 AM:
On Tue, Dec 21, 2010 at 1:52 PM, Neil Van Dyke wrote:
Note that the special syntax of the template library does not and will never
permit extraneous nesting in the static (Racket syntax) portions of the
template. Extraneous nesting is a convenience
On Tue, Dec 21, 2010 at 1:52 PM, Neil Van Dyke wrote:
> Note that the special syntax of the template library does not and will never
> permit extraneous nesting in the static (Racket syntax) portions of the
> template. Extraneous nesting is a convenience for dynamic parts.
Can you expand on this
Comments requested from anyone who has used SXML or xexprs...
I've almost finished a set of new PLaneT packages for a new variation on
SXML and PLT xexprs, and am second-guessing one of the design decisions.
Originally, my main goal was to unify SXML, PLT xexprs, and SHTML. Part
of that invo
On 2010 Dec 21, at 11:50, Sayth Renshaw wrote:
> Doing the netpay of employee tax = 0.15 and pay = hrs *12. From the beginner
> tutorial. I see two ways a simple and a hard way but neither work.
I think you may need to go a little further back in the tutorial. It looks
like you're misunderstan
On Dec 21, 2010, at 6:50 AM, Sayth Renshaw wrote:
> I am sure I am trying to over define this but not sure how to use other
> methods in Racket yet only beginning. So Hi everyone.
>
> Doing the netpay of employee tax = 0.15 and pay = hrs *12.
Follow the recipe.
1) Write a function contract ans
I am sure I am trying to over define this but not sure how to use other
methods in Racket yet only beginning. So Hi everyone.
Doing the netpay of employee tax = 0.15 and pay = hrs *12. From the beginner
tutorial. I see two ways a simple and a hard way but neither work.
Hard way
(define (hours h
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