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From: =?UTF-8?B?SsOpcsOpbWllIFJvcXVldA==?= <arkanosis@gmail.com>
Date: Thu, 10 May 2012 14:47:18 +0200
Message-ID: <CAFOazAOiu8mrdM5VVkR3=oG2jF-a0BGR7_ZFkBMHeqCTLBsmxA@mail.gmail.com>
Subject: Re: logical NOT
To: Mark van Dijk <lists+zsh@internecto.net>
Cc: zsh-users@zsh.org
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Hi,

2012/5/10 Mark van Dijk <lists+zsh@internecto.net>:
> % echo $(( [#2] ~0xAC ))
> -2#10101101
>
> I'd appreciate thoughts on this, and to hear if it makes any sense at
> all :)

16#0xAC =3D 2#10101100
~16#0xAC =3D ~2#00000000000000000000000010101100 (this is not =E2=80=9Clogi=
cal
not=E2=80=9D, btw, it's =E2=80=9Cone's complement=E2=80=9D)
~16#0xAC =3D 2#11111111111111111111111101010011
which is a *signed* negative number of value 2#10101101 (see
https://en.wikipedia.org/wiki/Two's_complement)
~16#0xAC =3D -2#10101101

Makes sense for me=E2=80=A6 the complement is not limited to the most
significant set bit and the bits on its right, and these are signed
numbers.

Best regards,

--=20
J=C3=A9r=C3=A9mie