[Qt-interest] Why 1/255 is 0 ?

[Atlant Schmidt]

All:

> Also:
>        double c = 1.0 / 255;
>        double c = 1 / 255.0;

  Heck, go for broke and say:

    double c = 1.0 / 255.0;

  Generally speaking, in just about any language, when you
  intend a number to be considered as a floating point number,
  you should *STATE* it as a floating point number. That avoids
  any possibility of ambiguity between you and the compiler/
  interpreter.

  And don't just write it as "1." -- "1.0" is a lot more
  "visible" to a future maintainer.

                       Atlant

-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Thiago Macieira
Sent: Wednesday, October 13, 2010 10:28
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Why 1/255 is 0 ?

On Wednesday 13. October 2010 16.15.27 Reece Dunn wrote:
> On 13 October 2010 15:11, Hannu Shemeikka <hps at shemeikka.org> wrote:
> > Hi,
> >
> > Could someone explain me this:
> >
> > double c = 1/255;
>
> That is an integer division that is rounded to the nearest whole integer.
>
> Try:
>
>     double c = double(1)/255;

Also:
        double c = 1.0 / 255;
        double c = 1 / 255.0;

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358

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