Checking Credit Cards (#122)
in [Ruby]
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From: James Edward Gray II on 3 May 2007 15:51 On May 3, 2007, at 9:35 AM, anansi wrote: > James Edward Gray II wrote: >> On May 3, 2007, at 9:15 AM, anansi wrote: >>>> Ruby Quiz will now take a one week break. Work has been rough >>>> this week and I >>>> need some down time. I'll be back next week, rested, and with >>>> new quizzes... >>> >>> >>> Means that: no quiz tomorrow ?!? >> Yes. I need a short break. We will have one the following Friday >> though. >> James Edward Gray II > > > > Maybe someone is interested or has an idea for an unoffical Ruby > Quiz for this week. Have you worked all 122 quizzes? ;) James Edward Gray II
From: Robert Dober on 4 May 2007 05:25 BTW we missed the score of Pascal's half of a hexagon by the numbers of edges of a pentagon (no politics involved here). I express myself like this because I am a square head of course;) If you get my point you will miss the line under the triangle but I could not come up with this. Maybe I should just have submitted ten solutions ;) Take advantage of your break James. Cheers Robert
From: Christian Neukirchen on 4 May 2007 09:31 Daniel Martin <martin(a)snowplow.org> writes: > Just one minor nit: > > Christian Neukirchen <chneukirchen(a)gmail.com> writes: > >> def luhn?(n) >> f = 2 >> (n.delete("^0-9").reverse.split(//).map{|d|d.to_i}. >> inject(0) { |a,e| f=3-f; a + (e*f > 9 ? e*f-9 : e*f) } % 10).zero? >> end > > You do know that (e*f > 9 ? e*f-9 : e*f) is equivalent to e*f%9, > right? So that makes this method: I first thought that too, and it cost me 10min to find that 9%9 == 0. -- Christian Neukirchen <chneukirchen(a)gmail.com> http://chneukirchen.org
From: Martin DeMello on 6 May 2007 14:58 On 5/4/07, Robert Dober <robert.dober(a)gmail.com> wrote: > BTW we missed the score of Pascal's half of a hexagon by the numbers > of edges of a pentagon (no politics involved here). I express myself I don't think half a hexagon is what you think it is :) martin
From: Robert Dober on 6 May 2007 17:04
On 5/6/07, Martin DeMello <martindemello(a)gmail.com> wrote: > On 5/4/07, Robert Dober <robert.dober(a)gmail.com> wrote: > > BTW we missed the score of Pascal's half of a hexagon by the numbers > > of edges of a pentagon (no politics involved here). I express myself > > I don't think half a hexagon is what you think it is :) Hmm you think to know what I think, I think you know more than me than ;) > > martin > > -- You see things; and you say Why? But I dream things that never were; and I say Why not? -- George Bernard Shaw |