linux-kernel - Re: Floating Point Issue

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Message-Id: <1190917504.6668.52.camel@heimdal.trondhjem.org>
Date:	Thu, 27 Sep 2007 14:25:04 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	mahamuni ashish <ash_lkp@...oo.co.in>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Floating Point Issue

On Thu, 2007-09-27 at 12:41 +0100, 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?

'cos 'strlen(ch)' isn't defined until you've initialised ch. If you swap
that line out with 'memset(ch, '\0', sizeof(ch))' then it will work.

Not a kernel bug, and hence not appropriate material for this list.

Trond

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