From: HIToC <hitoc_mail@yahoo.it>
To: Jagadeesh Bhaskar P <jbhaskar@hclinsys.com>
Cc: Linux C programming <linux-c-programming@vger.kernel.org>
Subject: Re: Bitfields
Date: Wed, 1 Dec 2004 20:44:38 +0100 [thread overview]
Message-ID: <200412012042.09952.hitoc_mail@yahoo.it> (raw)
In-Reply-To: <1101875142.7423.2.camel@myLinux>
On Wednesday 01 December 2004 05:25, Jagadeesh Bhaskar P wrote:
> Hi all,
> What is a bitfield? How is it used in C??
>
> TIA
It is possible to use several of bit variables like fields within a struct.
You have to indicate first the name of the field, then the number of bits
that the field occupies. Also you have to put double points ":" between
the filed's name and its bit-size.
For example, you want to save the current date; you can define a
struct Date (YYYY/MM/DD) like this
struct Date { // Date format: YYYY/MM/DD
unsigned year : 7; // 0-127 (2000-2127) [7 bits size]
unsigned month : 4; // 1-12 [4 bits size]
unsigned day : 5; // 1-31 [5 bits size]
};
In this case we have the complete date in a 16 bit variable (7+4+5=16 bit)!
--
With regards,
HIToC
hitoc_mail@yahoo.it
next prev parent reply other threads:[~2004-12-01 19:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-01 4:25 Bitfields Jagadeesh Bhaskar P
2004-12-01 19:44 ` HIToC [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-12-01 10:59 Bitfields Ronaldo Zacarias Afonso
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