padding related questions have been discussed many times . plz search.
On Sun, Sep 4, 2011 at 4:13 PM, bharatkumar bagana <
[email protected]> wrote:
> struct data
> {
> char a;
> int b;
> }__attribute__((packed));
> This is way to get the actual size of struct without any padding
> http://tuxsudh.blogspot.com/2005/05/structure-packing-in-gcc.html
>
>
> On Sun, Sep 4, 2011 at 2:38 AM, Debabrata Das <
> [email protected]> wrote:
>
>> @Dheeraj, Thanks for the link
>> @Anshul
>> Considering double to be alligned as a 4 byte boundary..
>> structc_tag
>>
>> c 1 byte
>> padding 1 byte
>> padding 1 byte
>> padding 1 byte
>> double 8 byte
>> int 4 byte
>>
>> whole structure is multiple of 4 so no padding required.
>>
>> structd_tag
>>
>> 8 byte for double
>> 4 byte for int
>> 1 byte for char
>> padding 3 byte
>>
>> last 3 byte padding for structure size to be multiple of 4
>>
>> Correct me if am wrong....
>>
>> On Sun, Sep 4, 2011 at 2:40 AM, Anshul AGARWAL
>> <[email protected]> wrote:
>> > #include <stdio.h>
>> >
>> > // structure C
>> > typedef struct structc_tag
>> > {
>> > char c;
>> > double d;
>> > int s;
>> > } structc_t;
>> >
>> > // structure D
>> > typedef struct structd_tag
>> > {
>> > double d;
>> > int s;
>> > char c;
>> > } structd_t;
>> >
>> > int main()
>> > {
>> >
>> >
>> > printf("sizeof(structc_t) = %d\n", sizeof(structc_t));
>> > printf("sizeof(structd_t) = %d\n", sizeof(structd_t));
>> >
>> > return 0;
>> > }
>> > plz explain the output ??
>> >
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>
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