[Cuis-dev] Hello, new Cuis smalltalk user here!

[Joseph Turco]

I understand its asciikey - 65/+ 3 modulio 26+26, but I just didn't get calculation. I am just going to google things if I get stuck. I also need to back up and understand how to call what messages and which ones I can use together/near each other.

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-------- Original Message --------
On Jul 16, 2021, 11:46 PM, Phil B via Cuis-dev wrote:

> Is the issue that you don't understand how/why the math is being done on the letters? If that's it, it's an old trick (older than programming) that you can convert each character to a numeric value[1], perform some calculations to transform them to something else, then back to characters again. It's a common technique for simple ciphers/encodings. If that's not it, it would really be helpful if you could explain what specifically about the math is throwing you.
>
> One word of warning: while the Cuis Book is an easy read, it does have more math[2] than your typical pre-college level intro to programming book for some of the core game calculations which can't be avoided when you're dealing with thrust, projectiles and gravity. So unless you are prepared to just take some of the math parts coming up on faith and skip over exercises as needed, you may find some of the later sections frustrating. This level of math isn't needed to learn how to program, but is to implement the particular game the book covers.
>
> [1] https://en.wikipedia.org/wiki/ASCII
>
> [2] My estimate just from a quick scan is intermediate Algebra with some basic Trigonometry. You don't need to understand the math to just *use* the code presented, but will if you want to understand what's going on with it.
>
> On Fri, Jul 16, 2021 at 10:45 PM Joseph Turco <jturk90 at protonmail.com> wrote:
>
>> Thanks for getting back to me.
>>
>> I understand how yo highlight messages and such to figure out how they work. Its the math I didn't understand. I'm also having a hard time grasping how some things work like how some statements are written. Another example I had a problem was the question asking to make a method for the Star mass. I didn't get the influence of adding a class declaration at the top.
>>
>> Maybe I just don't get OOP. I don't know, as I said I'm very new to programming and I'll also admit I have very basic math skills. Sorry if I'm bothering you at all...
>>
>> Sent from ProtonMail mobile
>>
>> -------- Original Message --------
>> On Jul 16, 2021, 10:39 PM, Phil B via Cuis-dev < cuis-dev at lists.cuis.st> wrote:
>>
>>> If you highlight the message you don't understand, right click and then select 'implementors of it' you'll see a list of every implementation of the method in the image (including a couple that have good comments explaining what it does.) This will work for any message in that expression (to:, collect: (which was missing the colon), asciiValue, -, +, \\, asCharacter) You can also pull apart the expression and see what the different parts of it do such as ($A to: $Z), $A asciiValue etc. by copy/pasting them into a Workspace and printIt (either via the context menu or keyboard shortcut)
>>>
>>> On Fri, Jul 16, 2021 at 9:07 PM Joseph Turco via Cuis-dev <cuis-dev at lists.cuis.st> wrote:
>>>
>>>> Hello Hilaire.
>>>>
>>>> You mentioned about me looking for anything in the book, and I do have one thing to mention. Some of the exercises are kinda difficult and I've had to goto the solution. Most of them made sense after looking at the solution, but some of them I don't understand. For example.
>>>>
>>>> Exercise 4.9
>>>>
>>>> ($A to: $Z) collect [:c | (c asciiValue - 65 + 3 \\ 26 + 65) asCharacter] .
>>>>
>>>> I have no clue how that math calculation works at all.
>>>>
>>>> Sent from ProtonMail mobile
>>>>
>>>> -------- Original Message --------
>>>> On Jul 15, 2021, 11:40 AM, Hilaire Fernandes via Cuis-dev < cuis-dev at lists.cuis.st> wrote:
>>>>
>>>>> Hi Joseph,
>>>>>
>>>>> As your eyes are new on the book. It will be very useful to let us know about any issue or misunderstanding you encounter while struding the book.
>>>>>
>>>>> Happy reading
>>>>>
>>>>> Hilaire
>>>>>
>>>>> Le 15/07/2021 à 16:01, Joseph Turco via Cuis-dev a écrit :
>>>>>
>>>>>> Oh wow thanks! I downloaded the book and it seems like its a lot better suited. I'll follow that instead.
>>>>>
>>>>> --
>>>>> GNU Dr. Geo
>>>>> http://drgeo.eu
>>>>>
>>>>> http://blog.drgeo.eu
>>>>>
>>>>> --
>>>>> Cuis-dev mailing list
>>>>> Cuis-dev at lists.cuis.st
>>>>> https://lists.cuis.st/mailman/listinfo/cuis-dev
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