padding mechanism in structures

From: "Roman Mashak" <mrv@xxxxxxxx>
Date: Wed, 15 Jun 2005 20:53:09 +0900

Hello, All!

Could you please explain me how is the padding of 'structure' fields is
made?

For example:

struct {
char a1;
int a2;
double a3;
} str;

When I'm checking "sizeof str" in GCC compiler I get the value of size as
16, it means some bytes are padded right?

Thanks!

PS. Or, point me to Inet link, if there is one.

With best regards, Roman Mashak. E-mail: mrv@xxxxxxxx

.

Follow-Ups:
- Re: padding mechanism in structures
  - From: Lew Pitcher
- Re : padding mechanism in structures
  - From: Jean-Claude Arbaut
- Re: padding mechanism in structures
  - From: Mehta Shailendrakumar

Prev by Date: Re: pow(2, 1/2) != pow(2, 0.5) problem
Next by Date: Re: pow(2, 1/2) != pow(2, 0.5) problem
Previous by thread: Re: Total protection for your software against crack
Next by thread: Re: padding mechanism in structures
Index(es):
- Date
- Thread

Relevant Pages

What do you think about the code?
... struct field_desc { ... int length; ... char **entries; ... char *str, *tmp; ...
(comp.lang.c)
Re: why does this code leak?
... char *str; ... str = (char *)malloc; ... Purify Heap Analysis ... The freeworks for the dynamically allocated int but not for the ...
(comp.unix.programmer)
Re: A question on malloc() and calloc()
... int main{ ... char *str = NULL; ... I thought the difference between calloc and malloc is that calloc ...
(comp.lang.c)
[PATCH 5/5 v4] vsprintf: unify the format decoding layer for its 3 users
... Why not make the variable "const char *" and drop the cast? ... Subject: vsprintf: unify the format decoding layer for its 3 users ... if (buf < end) ... char *str, *end, c; ...
(Linux-Kernel)
Re: What do you think about the code?
... you can write any code that uses a goto, ... int length; ... char **entries; ... char *str, *tmp; ...
(comp.lang.c)