linux-kernel - Re: Floating Point Issue

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Message-ID: <Pine.LNX.4.61.0709271645590.5183@chaos.analogic.com>
Date:	Thu, 27 Sep 2007 16:53:04 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	"mahamuni ashish" <ash_lkp@...oo.co.in>
Cc:	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: Floating Point Issue

If Windows lets you get away with this, then Windows is broken.
memset(ch,'\0',strlen(ch) );

'ch' is uninitialized local data. Nobody knows what evil lurks...

Thay said, the kernel will make sure that any data that gets
put into your address-space doesn't contain anybody else's
information --that's all. The junk on your stack was created
by your task.

On Thu, 27 Sep 2007, mahamuni ashish wrote:

> I have small code....
>
> #include <stdio.h>
> #include <string.h>
>
> int main()
> {
> float f= 1256.35;
> char ch[4];
>
> printf("\n1. f : %f",f);
> memset(ch,'\0',strlen(ch) );
> printf("\n2. f : %f",f);
> return 0;
> }
>
> Expected output is
> 1. f : 1256.35
> 2. f : 1256.35
>
> But I am getting the output
> (on windows)
> 1. f : 1256.35
> 2. f : 0.000000
>
> (on Linux)
> 1. f : 1256.35
> segmentation fault
>
> why?
>
>
>      Forgot the famous last words? Access your message archive online at http://in.messenger.yahoo.com/webmessengerpromo.php
>
> -
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>

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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