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Mail Archives: djgpp/2002/04/10/04:32:18

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From: Jukka-Pekka Suominen INF <jusuomin AT abo DOT fi>
Subject: Re: Weird double problem?!
Newsgroups: comp.os.msdos.djgpp,comp.lang.c++
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Date: Wed, 10 Apr 2002 11:00:04 +0300
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Taras wrote:

>   stepSize = 0.1;
>don't think it has something to do with the
> displaying of the number, because when I store the result of
> 1/stepSize

Here you should use 1.0/stepSize instead of 1 to perform a floating point 
division instead of an integer division.

> into an integer variable, the value of that variable is 9 (when it
> should be
> 10) Does anyone know where the last digit came from?

It comes from the binary representation of 0.1 decimal. This value cannot 
be accurately represented as a binary value (powers of two), so instead you 
get an approximation.

Jukka-Pekka Suominen

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