RE: at2 swap_nibbles

I see, ok. I'll fix, thanks.

--
Oded Arbel
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::..
Fingle's laws for existentialists -
10.If everything seems to be going well, you have obviously overlooked something.


> -----Original Message-----
> From: Richard Braakman [mailto:[email protected]]
> Sent: Monday, November 25, 2002 6:16 PM
> To: [email protected]
> Subject: Re: at2 swap_nibbles
> 
> 
> On Mon, Nov 25, 2002 at 05:46:51PM +0200, Oded Arbel wrote:
> > i don't think its related to anything.
> > the char type is a byte sized data storage, and the 
> signed/unsigned behaviour is only important when casting to 
> different types.
> 
> It matters because of this:
> 
>   return ( ( byte & 15 ) * 10 ) + ( byte >> 4 );
> 
> The >> operator is allowed to sign-extend its operand, so that -16
> (0xf0h) becomes -1 (0xffh).  It won't do this if chars are unsigned,
> in which case 0xf0h just becomes 0x0fh.
> 
> Richard Braakman
> 
> 
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