On Tue, Feb 11, 2020 at 3:28 PM Alain De Vos wrote:
> But first i need a list of characters. :)
> Does the language has a conversion operator ?
>
Yes, `string->list`:
https://docs.racket-lang.org/reference/strings.html#(def._((quote._~23~25kernel)._string-~3elist))
But read on …
On Tue, Feb
You can convert a string to a list of characters by using string->list. The
code snippet that you presented in your very first post also uses this
function.
> (string->list "abc")
- : (Listof Char)
'(#\a #\b #\c)
What I want to ask you though is what is wrong with the code that Phillip
In C I would would do some very simple pointer arithmetic, but racket
leaves me into the blue.
Documentation, which is fine, compared to other lisps, fyi chez, leaves me
into the blue.
0) Given a string,
1) convert to a list of characters,
2) allow me to iterate,
3) convert a character to an
Ok
Turns out the better approach is to use the Built Package server with raco pkg
install —binary-lib packagename
https://pkg-build.racket-lang.org/about.html
:)
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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 tried the following
Is there a guide to making packages with -doc & -lib versions so you can
require the package-lib without getting/building the documentation?
Best,
Stephen
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Philip,
For the last part,
I will make my work through,
convert a string to collection/list of characters,
this to a collection/list of numbers with a value 48 subtracted i think,
this to the correct end value base10.
I have no complex numbers to deal with.
But at each step I should raise , this
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 this way, but here's
> an attempt at being more explicit.
>
> As you note, the result of `string->number` has the type `(U Complex
> False)`. If we try to think
Others have tried to be more Socratic in pointing you this way, but here's
an attempt at being more explicit.
As you note, the result of `string->number` has the type `(U Complex
False)`. If we try to think about about this in a version of the HtDP
design recipe, we have a few cases:
1.
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?`
>> True , i should use
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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You may want `exact-integer?`
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Indeed good question, but the following code works,
#lang typed/racket
(require typed/racket/gui)
(: fib (-> Integer Integer))
(define (fib n)
(if (< 2 n)
n
(+ (fib (- n 1))
(fib (- n 2)
(: numericalchar2integer (-> Char Integer))
(define (numericalchar2integer char)
What should `(myconversion "apple")` return?
What should `(myconversion "12.3")` return?
What does `string->number` do in each of those cases?
Ryan
On Tue, Feb 11, 2020 at 11:34 AM Alain De Vos
wrote:
> I tried the following function to conver a String to an Integer.
>
> #lang typed/racket
>
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
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