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two's complement function

• To: mathgroup at smc.vnet.net
• Subject: [mg44035] two's complement function
• From: "Ken Morgan" <kemorgan at vt.edu>
• Date: Sat, 18 Oct 2003 03:12:38 -0400 (EDT)
• Organization: Virginia Tech, Blacksburg, Virginia, USA
• Sender: owner-wri-mathgroup at wolfram.com

Can anyone think of a better way to produce a list of digits of a two's
complement integer than the following?

tc[n_, bits_:32] :=
If[Positive[n], IntegerDigits[n, 2, bits],
IntegerDigits[FromDigits[IntegerDigits[n, 2, bits] /. {1 -> 0, 0 -> 1}, 2] +
1, 2, bits]]

Thanks,
Ken

• Follow-Ups:
  • Re: two's complement function
    • From: "Peter Pein" <nospam@spam.no>