Re: structure size

[Mohammed Khalid Ansari <khalid@ncst.ernet.in>]

On Wed, 5 Mar 2003 hbajaj@hss.hns.com wrote:

> 
> 
> the structure size is always multiple of the size of element with max size in
> that structure.
> Suppose
> struct {
> int a;
> char b;
> }
> then size of struct will be multiple of the size of int i.e 4 on solaris.So size
> will be 8 bytes as sizeof(a)+sizeof(b) = 5 so to make it multiple of 4 it pads
> it with 3 bytes.

Why it is so? any specific reason!

> if we have
> struct {
> short int a;
> char b;
> }
> then size of struct will be multiple of the size of int i.e 2 on solaris.
> 
> Rgds
> Harvinder Bajaj
> 
> 
> 
> 
> Mohammed Khalid Ansari <khalid@ncst.ernet.in> on 05-03-2003 12:32:01 PM
> 
> To:   linux c programming mailing list <linux-c-programming@vger.kernel.org>
> cc:    (bcc: Harvinder Bajaj/HSS)
> 
> Subject:  structure size
> 
> 
> 
> 
> 
> Hi,
> 
> why the sizeof sturcture is alway greater than the collective sizes of all
> the elements in it.
> 
> eg
> struct node {
>      int  a;
>      char c;
>      int  b;
> };
> 
> int main()
> {
>      printf ("%d\n", sizeof (struct node));
>      return 0;
> }
> 
> 
> it prints 12 in my case.
> 
> where is the catch.
> 
> --
> 
> **************************************************************************
> 
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> 
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