Re: Help on bit operation

[Akos Marton <makos999@gmail.com>]

Hello Randi,

I suppose for you the bitfields is useful:
struct {
  int information_1: 6;
  int information_2: 4;
  int information_3: 8;
  int information_4: 5;
  int information_5: 9;
};
This solution is reduce the usage of memory, but needs more
computation in general C programming.
May there another solution using 'union {};' ?

mAkos

On Thu, Aug 27, 2009 at 1:02 AM, Randi Botse<nightdecoder@gmail.com> wrote:
> Hi, I'm beginner C programmer, i have a problem, i want to store some
> information in a integer, a integer will be 32 bit on my machine, i
> want to have as follow:
>
> 6 bit (information 1)   MSB
> 4 bit (information 2)
> 8 bit (information 3)
> 5 bit (information 4)
> 9 bit (information 5)   LSB
>
> For example i set the informations as follow (in decimal):
>
> information 1 = 43        or 101011
> information 2 = 11        or 1011
> information 3 = 120      or 1111000
> information 3 = 30        or 11110
> information 4 = 418      or 110100010
>
> if i join all informations i should get a 32 bit integer valued
> 2935782212 or 01010111011111100011110110100010, then my problem is how
> to retrieve these informations on bit operation? i want to know what's
> the value of information-2 or information-3, etc directly.  And, is
> there any good way to join these informations to be an 32 bit integer?
>
> at this time i convert the 32bit integer into binary string, process
> it's with array segment to get all informations then convert them to
> integer,
> to build the 32bit integer, i join all information value into binary
> string (yes, 32 bit of char ;p) join all of them then convert to
> integer.
>
> I know my way is sucks and too far away from COOL thing ;p,  i think
> there are cool way to do this!.
>
> Thanks before!
> --
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>



-- 
People seldom notice clothes, if you wear a big smile.
http://counter.li.org/
OLVASD: http://napirajz.hu
--
To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html