From: Todd Benson <caduceass@...>
Date: 2008-09-16T00:34:15+09:00
Subject: Re: how do deal with huge numbers and keep them accurate?

On Mon, Sep 15, 2008 at 9:36 AM, Tomi Zzzz <tomi_z@nana.co.il> wrote:
> thanks u all for taking a few minutes to answer me. I'm really
> embarrassed cause I wanted to simplify the question so, I didn't wrote
> down the actual code. I also sorry for not posting any answer yesterday.
> so once more, your help would be very much appreciate...
>
> (I'll drop the 3 lines at the beginning cause I don't sure about them,
> and don't want to mislead you. (talking about: include... require...
> etc).
>
> this is what i want to achieve with that code:
>
> number = gets.chomp.to_f
> divider = 3.0
> while number % divider != 0
> divider += 1.0
> end
> puts divider.to_s
> if divider == 3.0
>  puts "the number can be divided by " + divider.to_s
> else
>  puts "can't be divided"
> end
>
> that's it. sorry for repeating myself... once more:
> i want the ability to input a number like this:
> 333333333333333333333333333333331
> we all know that the answer will be something like that:
> 1111.....111.333333
> but the code will give me the answer that it can be divide by 3, and
> that's the main problem in that code.
>
> Thanks in advanced, Tomiz.
> p.s. i have tried to implement all of your suggestions with no luck.
> I've add the code for your comfort.

Once again, you are using floats...

irb(main):001:0> require 'bigdecimal'
=> true
irb(main):002:0> n = Bigdecimal('333333333333333333333333333333331')
=> #<BigDecimal:b7cf7418,'0.3333333333 3333333333 333333333 331E33,36(40)>
irb(main):003:0> d = Bigdecimal('3')
=> #<BigDecimal:b7d08754,'0.3E1',4(8)>
irb(main):004:0> (n % d).to_f
=> 1.0

Looks fine to me.

Todd