From: chen li <chen_li3@...>
Date: 2007-01-17T23:46:21+09:00
Subject: Re: how to translate base 10 number into base 2 number


--- "Eric I." <rubytraining@gmail.com> wrote:

> Hi Li,
> 
> First, here's a solution:
> 
> def ten_to_two(num1)
>   return [] if num1 <= 0
>   first,second=num1.divmod(2)
>   ten_to_two(first) << second
> end
> 
> And note that you can change the << into a call to
> unshift if you want
> the bits in the reverse order.
> 
> As for why your solution didn't work, let me offer
> two things.  First,
> you never do anything with the result of your
> recursive call to
> ten_to_two.  Somehow you need to combine it with the
> partial result you
> calculated immediately beforehand.  Second, you're
> using instance
> variables (tagged with the @).  That's generally
> done in methods
> defined within a class to hold the state of the
> instance.  For a
> "naked" method, you generally stick to local
> variables (no @).
> 
> Eric


Hi Eric,

Thanks for the explanations. It helps me out.

Li


 
____________________________________________________________________________________
Get your own web address.  
Have a HUGE year through Yahoo! Small Business.
http://smallbusiness.yahoo.com/domains/?p=BESTDEAL