I want to create a gui app.
But then I need:
#lang racket/gui
But when i click a button i want type control in the functions so i need :
#lang typed/racket
Are there solutions ?
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Or is it they idea to write own conversion functions to learn the language.
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I tried the following function to conver a String to an Integer.
#lang typed/racket
(: myconversion (-> String Integer))
(define (myconversion str)
(string->number str))
The error given is :
Type Checker: type mismatch
expected: Integer
given: (U Complex False) in: (string->number str)
I
ons ?
On Tuesday, February 11, 2020 at 12:02:46 PM UTC+1, Ryan Culpepper wrote:
>
> What should `(myconversion "apple")` return?
> What should `(myconversion "12.3")` return?
> What does `string->number` do in each of those cases?
>
> Ryan
>
>
On Tuesday, February 11, 2020 at 3:25:42 PM UTC+1, Ben Greenman wrote:
>
> You may want `exact-integer?`
> True , i should use exact-integer.
>
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No exact-integer is a check it is not a type.
The error described above remains
On Tuesday, February 11, 2020 at 3:50:27 PM UTC+1, Alain De Vos wrote:
>
>
>
> On Tuesday, February 11, 2020 at 3:25:42 PM UTC+1, Ben Greenman wrote:
>>
>> You may want `exact-integer?`
>
gt; but ultimately can't escape. (Ignoring for the moment fancier type systems
> that are mostly still research projects.)
>
> Your problem with `sweet-exp` is a different one. I'm not familiar with
> `sweet-exp`, so I can't really help you, but it looks like either a bug
, this is not ok.
Otherwise the GUI just keeps eating memory ...
On Tuesday, February 11, 2020 at 8:09:31 PM UTC+1, Alain De Vos wrote:
>
>
>
> On Tuesday, February 11, 2020 at 5:33:37 PM UTC+1, Philip McGrath wrote:
>>
>> Others have tried to be more Socratic in pointing you
to an int ,
4) subtract corresponding value of zero,
5) allow me to some positional stuff and addition.
But first i need a list of characters. :)
Does the language has a conversion operator ?
On Tuesday, February 11, 2020 at 8:50:33 PM UTC+1, Alain De Vos wrote:
>
> Very basic question, firs
Very basic question, first step first, how do i convert a string astring to
a list of characters,
#lang typed/racket
(require typed/racket/gui)
(: astring String)
(define astring "1234567890")
On Tuesday, February 11, 2020 at 11:34:16 AM UTC+1, Alain De Vos wrote:
>
> I tri
nal)))
(print (send (new aninteger% [x 2]) getx))
On Sunday, February 16, 2020 at 12:18:53 AM UTC+1, Alain De Vos wrote:
>
>
> Following code makes an "integerclass" with an "add" method :
>
> #lang racket
> (define (integerclass x)
> (define (getx)
be done by
> hand here.
>
> 2. What specific error message did you get?
>
> *~slg*
>
>
> ‐‐‐ Original Message ‐‐‐
> On Saturday, February 15, 2020 6:18 PM, Alain De Vos > wrote:
>
>
> Following code makes an "integerclass" with an "add&quo
ing2value "12345"))
On Tuesday, February 11, 2020 at 11:34:16 AM UTC+1, Alain De Vos wrote:
>
> I tried the following function to conver a String to an Integer.
>
> #lang typed/racket
> (: myconversion (-> String Integer))
> (define (myconversion str)
>
Following code makes an "integerclass" with an "add" method :
#lang racket
(define (integerclass x)
(define (getx) x)
(define (setx! x_new) (set! x x_new))
(define (add y)(integerclass (+ x (y 'getx
(lambda (message . args)
(case message
((getx) (apply getx
Check if the distance from (0,0) is "small enough" ?
On Friday, November 19, 2021 at 9:32:23 PM UTC+1 Stephen Chang wrote:
> I dont want to fully support complex numbers. I just want to do the
> minimum so that programs that dont use them are not blocked by the
> lack of support
>
> On Fri, Nov
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