From: Paolo Bonzini <bonzini@...>
Date: 2008-02-09T01:59:56+09:00
Subject: Re: how can 1/100=0

On Feb 8, 5:20 pm, Junkone <junko...@gmail.com> wrote:
> On Feb 8, 11:09 am, Paolo Bonzini <bonz...@gnu.org> wrote:
>
>
>
> > On Feb 8, 5:06 pm, Junkone <junko...@gmail.com> wrote:
>
> > > cannot belive my eyes. how can 1/100 be equal to 0.
> > > E:\Documents and Settings\Roasty>irb
> > > irb(main):001:0> TRAILING_STOP=1/100
> > > => 0
> > > irb(main):002:0> TRAILING_STOP
> > > => 0
> > > irb(main):003:0>
>
> > in what languages it isn't?
>
> > $ python
> > Python 2.5.1 (r251:54863, May 12 2007, 11:15:25)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.>>> 1/100
>
> > 0
>
> > (and C too, though I won't write the program here).
>
> > anyway, you can have 1/100 return a rational:
>
> > $ irb
> > irb(main):001:0> require 'mathn'
> > => true
> > irb(main):002:0> 1/100
> > => 1/100
> > irb(main):003:0> (1/100).denominator
> > => 100
>
> > Paolo
>
> should 1/100=.01 ????

Even in C, 1/100 = 0.  But 1.0/100.0 or 1.0/100 or 1/100.0 = 0.01
because the division is done in floating-point math.

Paolo