Re: [algogeeks] Padding....
padding related questions have been discussed many times . plz search.
On Sun, Sep 4, 2011 at 4:13 PM, bharatkumar bagana <
bagana.bharatku...@gmail.com> 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 <
> debabrata.barunhal...@gmail.com> 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
>> int4 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
>> wrote:
>> > #include
>> >
>> > // structure C
>> > typedef struct structc_tag
>> > {
>> >charc;
>> >double d;
>> >int s;
>> > } structc_t;
>> >
>> > // structure D
>> > typedef struct structd_tag
>> > {
>> >double d;
>> >int s;
>> >charc;
>> > } 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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Re: [algogeeks] Padding....
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 <
debabrata.barunhal...@gmail.com> 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
> int4 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
> wrote:
> > #include
> >
> > // structure C
> > typedef struct structc_tag
> > {
> >charc;
> >double d;
> >int s;
> > } structc_t;
> >
> > // structure D
> > typedef struct structd_tag
> > {
> >double d;
> >int s;
> >charc;
> > } 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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Re: [algogeeks] Padding....
@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
int4 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
wrote:
> #include
>
> // 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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Re: [algogeeks] Padding....
#include
// structure C
typedef struct structc_tag
{
charc;
double d;
int s;
} structc_t;
// structure D
typedef struct structd_tag
{
double d;
int s;
charc;
} 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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Re: [algogeeks] Padding....
i thnk it should be
4 for int
1 for char
4 for float
3 padding to make multiple of 4..i read it from
http://forums.techarena.in/software-development/1241260.htm
correct me if am wrong
On Sun, Sep 4, 2011 at 1:54 AM, Karthikeyan palani wrote:
> in 32 bit m/c
>
> 4 for int
> 1 for char + 3 padding
> 4 for float
> so, totally it takes 12 bytes..
>
> On 03/09/2011, rahul sharma wrote:
> > ans is: 16 i thninkj...
> > float take 8 bytes
> >
> > so pdding is :-
> >
> > int take 4 bytes
> > 1 char
> > 3 bytes pad
> > + 8 byte float=16
> >
> >
> > On Sat, Sep 3, 2011 at 10:30 PM, siddharam suresh
> > wrote:
> >
> >> each object in the structure will take one memory word.(if one object
> then
> >> its size of that object)
> >> Thank you,
> >> Sid.
> >>
> >>
> >>
> >> On Sat, Sep 3, 2011 at 10:27 PM, Debabrata Das <
> >> debabrata.barunhal...@gmail.com> wrote:
> >>
> >>> how output is 12 on typical 32 bit system and why?
> >>> #include
> >>> struct x
> >>> {
> >>> int y;
> >>> char x;
> >>> float z;
> >>> };
> >>> main()
> >>> {
> >>> printf("%d",sizeof(struct x));
> >>> }
> >>>
> >>> what is the rule of padding
> >>>
> >>> --
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> >
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Re: [algogeeks] Padding....
in 32 bit m/c
4 for int
1 for char + 3 padding
4 for float
so, totally it takes 12 bytes..
On 03/09/2011, rahul sharma wrote:
> ans is: 16 i thninkj...
> float take 8 bytes
>
> so pdding is :-
>
> int take 4 bytes
> 1 char
> 3 bytes pad
> + 8 byte float=16
>
>
> On Sat, Sep 3, 2011 at 10:30 PM, siddharam suresh
> wrote:
>
>> each object in the structure will take one memory word.(if one object then
>> its size of that object)
>> Thank you,
>> Sid.
>>
>>
>>
>> On Sat, Sep 3, 2011 at 10:27 PM, Debabrata Das <
>> debabrata.barunhal...@gmail.com> wrote:
>>
>>> how output is 12 on typical 32 bit system and why?
>>> #include
>>> struct x
>>> {
>>> int y;
>>> char x;
>>> float z;
>>> };
>>> main()
>>> {
>>> printf("%d",sizeof(struct x));
>>> }
>>>
>>> what is the rule of padding
>>>
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Re: [algogeeks] Padding....
ans is: 16 i thninkj...
float take 8 bytes
so pdding is :-
int take 4 bytes
1 char
3 bytes pad
+ 8 byte float=16
On Sat, Sep 3, 2011 at 10:30 PM, siddharam suresh
wrote:
> each object in the structure will take one memory word.(if one object then
> its size of that object)
> Thank you,
> Sid.
>
>
>
> On Sat, Sep 3, 2011 at 10:27 PM, Debabrata Das <
> debabrata.barunhal...@gmail.com> wrote:
>
>> how output is 12 on typical 32 bit system and why?
>> #include
>> struct x
>> {
>> int y;
>> char x;
>> float z;
>> };
>> main()
>> {
>> printf("%d",sizeof(struct x));
>> }
>>
>> what is the rule of padding
>>
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Re: [algogeeks] Padding....
each object in the structure will take one memory word.(if one object then
its size of that object)
Thank you,
Sid.
On Sat, Sep 3, 2011 at 10:27 PM, Debabrata Das <
debabrata.barunhal...@gmail.com> wrote:
> how output is 12 on typical 32 bit system and why?
> #include
> struct x
> {
> int y;
> char x;
> float z;
> };
> main()
> {
> printf("%d",sizeof(struct x));
> }
>
> what is the rule of padding
>
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[algogeeks] Padding....
how output is 12 on typical 32 bit system and why?
#include
struct x
{
int y;
char x;
float z;
};
main()
{
printf("%d",sizeof(struct x));
}
what is the rule of padding
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