From: Sylvester Keil <sylvester.keil@...>
Date: 2011-12-05T20:17:30+09:00
Subject: Re: Stupid question


On Dec 5, 2011, at 11:38 AM, Robert Klemme wrote:

> On Mon, Dec 5, 2011 at 10:03 AM, James Gallagher
> <lollyproductions@mac.com> wrote:
>> Thank you everyone for Helping me out.  :-)
> 
> If I am not mistaken, everybody in this thread resorted to using a
> string conversion.  Why does nobody want to calculate this
> numerically?

I posted a similar version to yours which uses an iterator.

n = 2011
n.size.pred.downto(0).reduce(0) { |sum, a| sum += (n.abs / 10 ** a) % 10 }

The while loop is more straightforward though. Perhaps we could combine the two?

> 
>>> x = 2011
> => 2011
>>> q = 0
> => 0
>>> a = x
> => 2011
>>> while a>0;a,b=a.divmod 10;q+=b;end
> => nil
>>> q
> => 4
> 
> Granted, this is not too short - but it works without creating a
> String instance.
> 
> Kind regards
> 
> robert
> 
> -- 
> remember.guy do |as, often| as.you_can - without end
> http://blog.rubybestpractices.com/
>