Creating a 2s compliment hex string for negitive numbers
bSneddon
w.g.sneddon at gmail.com
Fri Aug 1 17:25:40 EDT 2014
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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