Re: Creating a 2s compliment hex string for negitive numbers

Newsgroups	comp.lang.python
Date	2014-08-01 14:25 -0700
References	<17160115-a77f-436a-837c-cd2039a7c53f@googlegroups.com> <mailman.12523.1406926051.18130.python-list@python.org>
Message-ID	<f69f7aca-c744-452b-bbaa-e21699e42b5d@googlegroups.com> (permalink)
Subject	Re: Creating a 2s compliment hex string for negitive numbers
From	bSneddon <w.g.sneddon@gmail.com>

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On Friday, August 1, 2014 4:47:20 PM UTC-4, MRAB wrote:
> On 2014-08-01 21:35, bSneddon wrote:
> 
> > I need to calculate an error correction code for an old protocol.
> 
> >
> 
> > I calculate the integer 4617 and want to code the 2s compliment in ASCII
> 
> > hex EDF7.  When issue the following.
> 
> >>>> hex(-4617)
> 
> > '-0x1209'
> 
> >
> 
> > Does anyone know a clean way to get to the desired results?   My ECC will always
> 
> > be 16 bit (4 nibble) hex number.
> 
> >
> 
> Use a bitwise AND:
> 
> 
> 
>  >>> hex(-4617 & 0xFFFF)
> 
> '0xedf7'

Thanks

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Creating a 2s compliment hex string for negitive numbers bSneddon <w.g.sneddon@gmail.com> - 2014-08-01 13:35 -0700
  Re: Creating a 2s compliment hex string for negitive numbers MRAB <python@mrabarnett.plus.com> - 2014-08-01 21:47 +0100
    Re: Creating a 2s compliment hex string for negitive numbers bSneddon <w.g.sneddon@gmail.com> - 2014-08-01 14:25 -0700

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