From: Mehran Rezaei <mehran@cs.unt.edu>
To: Codex <codex@telkom.net>
Cc: Linux-C-Programming <linux-c-programming@vger.kernel.org>
Subject: Re: value assignment
Date: Tue, 10 Sep 2002 08:29:19 +0000 [thread overview]
Message-ID: <3D7DAD5F.1E822F2C@cs.unt.edu> (raw)
In-Reply-To: 20020910235856.25bd3fd3.codex@telkom.net
Codex wrote:
> pterm.iflag &= ~(IGNBRK | INLCR)
>
> what the hell is '&=' and '~(...)', what does '(...)' does anyway..?,
> wasn't '|' means OR..?
>
Good morning,
So, they are all bitwise operations. & is bitwise AND, | is OR, ~ one's complement.
Do you know what happens when you say i*=5 (i=i*5), the same thing when you say i&=5
(i=i&5).
Say i is 15 then i&=5 is 001111 & 000101 = 000101. ~ is a little bit more
complecated, that is when the size of your variable is important. If i is an integer
(of course the size of i depends on your system, but generally say 32 bits) then ~i
(when i is 15) will be
~0000000000001111=1111111111110000=fff0 Hex.
So long,
Mehran
next prev parent reply other threads:[~2002-09-10 8:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-10 16:58 value assignment Codex
2002-09-10 8:29 ` Mehran Rezaei [this message]
2002-09-10 15:39 ` Stephen Satchell
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