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Re: Javascript Math problem

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Michael Haufe (TNO) wrote on 28 apr 2012 in comp.lang.javascript:

> On Friday, April 27, 2012 5:41:55 PM UTC-5, Tom wrote:
>> Hi, I was wondering if someone could help me with math puzzle.  I
>> need a function that will give me the number of times an integer is
>> divisible by 3, but I can't use the round function.   In other words,
>> if I sent the value of 6, it would return 2 since 6/3 = 2.  9/3 = 3
>> etc. For numbers that are not evenly divisible,  5/3 would need to
>> return 1, 7/3 would return 2 etc, basically scrap the decimal
>> numbers.  But like I said it can't use round.
>> 
>> I was thinking that possibly it would use some combination of the 
>> division and modulus operators (/,%), but I haven't been able to
>> figure it out yet.
>> 
>> Can anyone think of anything?  Thx
> 
> Simple enough for the mathematically inclined:
> 
> function f(n){ return (n-(n%3))/3 }

I would prefer (given n>=0 for both functions):

function f(n) {return Math.floor(n/3);};

visually simpler (so less bug-prone), and perhaps faster.

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Javascript Math problem Tom <thart@vicon.net> - 2012-04-27 15:41 -0700
  Re: Javascript Math problem Stefan Weiss <krewecherl@gmail.com> - 2012-04-28 01:33 +0200
    Re: Javascript Math problem Tom <thart@vicon.net> - 2012-04-27 18:02 -0700
    Re: Javascript Math problem Dr J R Stockton <reply1217@merlyn.demon.co.uk.not.invalid> - 2012-04-29 21:07 +0100
      Re: Javascript Math problem "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-04-30 08:06 +0000
        Re: Javascript Math problem Tom <thart@vicon.net> - 2012-04-30 01:33 -0700
        Re: Javascript Math problem Dr J R Stockton <reply1218@merlyn.demon.co.uk.not.invalid> - 2012-05-01 19:30 +0100
  Re: Javascript Math problem "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-04-27 17:30 -0700
    Re: Javascript Math problem Tom <thart@vicon.net> - 2012-04-27 18:05 -0700
    Re: Javascript Math problem Stefan Weiss <krewecherl@gmail.com> - 2012-04-28 04:00 +0200
      Re: Javascript Math problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-04-28 13:04 +0200
        Re: Javascript Math problem Stefan Weiss <krewecherl@gmail.com> - 2012-04-28 21:10 +0200
          Re: Javascript Math problem Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-04-28 22:23 +0200
            Re: Javascript Math problem "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2012-04-28 23:39 +0300
            JS/Terminology (was: Javascript Math problem) Stefan Weiss <krewecherl@gmail.com> - 2012-04-29 05:59 +0200
              Re: JS/Terminology Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-04-29 16:15 +0200
                Re: JS/Terminology Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-04-29 16:20 +0200
                Re: JS/Terminology Puzzled <scratching.head@example.com> - 2012-05-07 16:22 -0400
                Re: JS/Terminology Gene Wirchenko <genew@ocis.net> - 2012-05-07 14:36 -0700
                Re: JS/Terminology "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-05-08 08:40 +0000
                Re: JS/Terminology Gene Wirchenko <genew@ocis.net> - 2012-05-08 09:29 -0700
            Re: Javascript Math problem John G Harris <john@nospam.demon.co.uk> - 2012-04-29 17:30 +0100
          Re: Javascript Math problem Scott Sauyet <scott.sauyet@gmail.com> - 2012-04-30 06:19 -0700
            Re: Javascript Math problem Dr J R Stockton <reply1218@merlyn.demon.co.uk.not.invalid> - 2012-05-01 19:48 +0100
              Re: Javascript Math problem Gene Wirchenko <genew@ocis.net> - 2012-05-01 19:30 -0700
      Re: Javascript Math problem "Mel Smith" <med_cutout_syntel@aol.com> - 2012-04-28 09:00 -0600
    Re: Javascript Math problem "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-04-28 09:02 +0000

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