[#389739] Ruby Challenge — teresa nuagen <unguyen90@...>

Here is a ruby challenge for all you computer science lovers out there,

22 messages 2011/11/05
[#389769] Re: Ruby Challenge — "Jonan S." <jonanscheffler@...> 2011/11/05

Totally unrelated to any husker computer science programs right? Like

[#389905] Re: Ruby Challenge — Stephen Ramsay <sramsay.unl@...> 2011/11/09

Jonan S. wrote in post #1030330:

[#389907] Re: Ruby Challenge — aseret nuagen <unguyen90@...> 2011/11/09

> You mean like the professor for the course? Because that would be me .

[#389915] Re: Ruby Challenge — Robert Klemme <shortcutter@...> 2011/11/09

On Wed, Nov 9, 2011 at 4:52 AM, aseret nuagen <unguyen90@aim.com> wrote:

[#389792] Tricky DSL, how to do it? — Intransition <transfire@...>

I'd want to write a DSL such that a surface method_missing catches

18 messages 2011/11/06

[#389858] Compiling Ruby Inline C code - resolving errors — Martin Hansen <mail@...>

I am trying to get this Ruby inline C code http://pastie.org/2825882 to

12 messages 2011/11/08

[#389928] Forming a Ruby meetup group... — "Darryl L. Pierce" <mcpierce@...>

Where I work we have a local Ruby group that used to meet up, until the

12 messages 2011/11/09

[#389950] The faster way to read files — "Noé Alejandro" <casanejo@...>

Does anybody know which is the fastest way to read a file? Lets say

18 messages 2011/11/09

[#390064] referring to version numbers in a gem — Chad Perrin <code@...>

How do I specify and access a gem's version number within the code of the

28 messages 2011/11/11

[#390238] RVM problem, plz help — Misha Ognev <b1368810@...>

Hi, I have this problem:

15 messages 2011/11/16

[#390308] any command line tools for querying yaml files — Rahul Kumar <sentinel1879@...>

(Sorry, this is not exactly a ruby question).

11 messages 2011/11/18

[#390338] Newbie - cmd question — Otto Dydakt <ottodydakt@...>

I've literally JUST downloaded ruby from rubyinstaller.org.

21 messages 2011/11/19
[#390342] Re: Newbie - cmd question — Otto Dydakt <ottodydakt@...> 2011/11/19

OK thank you, I uninstalled & reinstalled, checking the three boxes at

[#390343] Re: Newbie - cmd question — "Ian M. Asaff" <ian.asaff@...> 2011/11/19

did you type "irb" first to bring up the ruby command prompt?

[#391154] Re: Newbie - cmd question — "Hussain A." <hahmad@...> 2011/12/12

Hi all,

[#391165] Re: Newbie - cmd question — Luis Lavena <luislavena@...> 2011/12/12

Hussain A. wrote in post #1036281:

[#390374] Principle of Best Principles — Intransition <transfire@...>

I seem to run into a couple of design issue a lot and I never know what is

16 messages 2011/11/20

[#390396] how to call Function argument into another ruby script. — hari mahesh <harismahesh@...>

Consider I have a ruby file called library.rb.

10 messages 2011/11/21

[#390496] How to make 1.9.2 my default version using RVM — Fily Salas <fs_tigre@...>

Hi,

25 messages 2011/11/24

[#390535] Is high-speed sorting impossible with Ruby? — "Gaurav C." <chande.gaurav@...>

Well, first of all, I'm new to Ruby, and to this forum. So, hello. :)

39 messages 2011/11/25
[#390580] Re: Is high-speed sorting impossible with Ruby? — Joao Pedrosa <joaopedrosa@...> 2011/11/27

Hi,

[#390593] Re: Is high-speed sorting impossible with Ruby? — "Gaurav C." <chande.gaurav@...> 2011/11/27

Joao Pedrosa wrote in post #1033884:

[#390600] Re: Is high-speed sorting impossible with Ruby? — Douglas Seifert <doug@...> 2011/11/27

A big gain can be had by disabling the garbage collector. Here is my best

[#390601] Re: Is high-speed sorting impossible with Ruby? — Douglas Seifert <doug@...> 2011/11/27

I've thrown various solutions up on github here:

[#390650] Loading a faulty ruby file - forcing this — Marc Heiler <shevegen@...>

Hi.

10 messages 2011/11/29

[#390689] Stupid question — James Gallagher <lollyproductions@...>

Hi everyone.

22 messages 2011/11/30

I need help understanding this small piece of code

From: Fily Salas <fs_tigre@...>
Date: 2011-11-04 14:13:49 UTC
List: ruby-talk #389726
Hi,

I have been trying to understand some code found in the "Learn to
Program" book and I'm having a hard time understanding it, I don't know
if its because I don't know math (which is true) or I don't simply
understand
how Ruby is interpreting the code.

//def old_roman_numeral (num)
///////  roman =3D ''
///////  roman =3D roman + 'M' * (num / 1000)
///////  roman =3D roman + 'D' * (num % 1000 / 500)
///////  roman =3D roman + 'C' * (num % 500 / 100)
///////  roman =3D roman + 'L' * (num % 100 / 50)
///////  roman =3D roman + 'X' * (num % 50 / 10)
///////  roman =3D roman + 'V' * (num % 10 / 5)
///////  roman =3D roman + 'I' * (num % 5 / 1)
///////  return roman
//end


puts(old_roman_numeral(1999))


What I don't know understand are the expressions surrounded with
parenthesis "(num % 1000 / 500) etc"
I do understand that we are passing a parameter when calling the method
and then multiplying the roman letters by this number passed as argument
but, what is... '(num % 1000 / 500)' =3D WHAT?

("number" "percentage"  1000 / 500) =3D WHAT?

Can someone be so kind and explain this a little bit?  I know this may
be my math but I don=E2=80=99t see (num % 1000 / 500) being a math equati=
on.

Thanks

-- =

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