From: Tom Rauchenwald <its.sec@...>
Date: 2006-07-10T09:17:40+09:00
Subject: Re: [QUIZ] Panagrams (#86)

"Tim Hollingsworth" <timhollingsworth@gmail.com> writes:

> Hello
>
> First post here, by the way.  Greetings to all:) New to ruby, love it, slaps
> on backs all round.
>
> While I haven't solved the pangram problem, I did find what appears to be a
> bug in Numeric.divmod on large numbers, as can be seen when using
> Bignum.modulo:
>
> irb(main):017:0> 1e22 % 1e21
> => 0.0
> irb(main):018:0> 1e23 % 1e22
> => 9.99999999999999e+021
>
> whoops!

Not quite. 1e23 is a float, that's why you run into precision
problems. This has been discussed here not long ago.
If you use Bignums it works as expected:

,----
| irb(main):001:0> 1e23.class
| => Float
| irb(main):002:0> (10**23).class
| => Bignum
| irb(main):003:0> 10**23 % 10**22
| => 0
`----

Tom