@nikhil my compiler gives sizeof long double =12
so aditya's concept is correct
On Mon, Jul 18, 2011 at 1:35 AM, aditya kumar
<aditya.kumar130...@gmail.com>wrote:
> @Nikhil
> thnks :)
>
>
> On Mon, Jul 18, 2011 at 1:32 AM, Nikhil Gupta
> <nikhilgupta2...@gmail.com>wrote:
>
>> That is again compiler dependent. Usually when hardware configuration is
>> taken into account, the compiler uses padding of 3 bytes. But in some cases,
>> for the ease of hardware access and faster implementation, 11 bytes are
>> padded. Possibly depends on your system hardware's synchronization with the
>> compiler.
>>
>>
>> On Mon, Jul 18, 2011 at 1:27 AM, aditya kumar <
>> aditya.kumar130...@gmail.com> wrote:
>>
>>> @Nikhil
>>> why is Address of long double : starts at 11 address locations from char
>>> variable ??
>>> is shud start from 3rd adress location from char variable bcoz memory
>>> cycle involves a word so are you padding 11bytes ??
>>>
>>>
>>> On Mon, Jul 18, 2011 at 1:24 AM, Nikhil Gupta <nikhilgupta2...@gmail.com
>>> > wrote:
>>>
>>>> @Sagar
>>>>
>>>> Memory sizes of long double variables are compiler and system
>>>> configuration dependent. So obviously, in accordance with your compiler,
>>>> the
>>>> size of long double is 8 bytes.
>>>>
>>>>
>>>> On Mon, Jul 18, 2011 at 1:22 AM, Nikhil Gupta <
>>>> nikhilgupta2...@gmail.com> wrote:
>>>>
>>>>> @Aditya
>>>>>
>>>>> Here is the padding effect :
>>>>>
>>>>> Address of char : starts anywhere
>>>>> Address of long double : starts at 11 address locations from char
>>>>> variable --> 1+11+12=24 bytes
>>>>>
>>>>>
>>>>> On Mon, Jul 18, 2011 at 1:10 AM, sagar pareek
>>>>> <sagarpar...@gmail.com>wrote:
>>>>>
>>>>>> @aditya
>>>>>> actually first see your post, you have written o/p=24 accordingly
>>>>>> padding done is perfect. But actually its printing 16.
>>>>>> So now question arises of padding
>>>>>>
>>>>>> and its pareek not prateek :)
>>>>>>
>>>>>>
>>>>>> On Mon, Jul 18, 2011 at 12:38 AM, aditya kumar <
>>>>>> aditya.kumar130...@gmail.com> wrote:
>>>>>>
>>>>>>> @prateek . can you explain me ?? i dint get padding logic in this
>>>>>>> example of mine.
>>>>>>>
>>>>>>> On Mon, Jul 18, 2011 at 12:30 AM, sagar pareek <
>>>>>>> sagarpar...@gmail.com> wrote:
>>>>>>>
>>>>>>>> sizeof long double is 12. So padding concept is perfectly working
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Jul 18, 2011 at 12:26 AM, aditya kumar <
>>>>>>>> aditya.kumar130...@gmail.com> wrote:
>>>>>>>>
>>>>>>>>> struct st
>>>>>>>>> {
>>>>>>>>> char ch1;
>>>>>>>>> long double ld;
>>>>>>>>> }s;
>>>>>>>>> printf("%d",sizeof(s));
>>>>>>>>> //output : 24 (for 32-bit compiler)
>>>>>>>>> ->as i have mentioned above the behaviour is undefined in case of
>>>>>>>>> sizeof (struct)
>>>>>>>>> can any one explain me why the padding concept does not work here
>>>>>>>>> ??
>>>>>>>>>
>>>>>>>>> On Mon, Jul 18, 2011 at 12:13 AM, Parthiban <jega...@gmail.com>wrote:
>>>>>>>>>
>>>>>>>>>> @Abhi:
>>>>>>>>>> Answers:
>>>>>>>>>> 1. whenever a 'const' qualifier is added previously to a variable
>>>>>>>>>> declaration it means that the value of the variable is automatically
>>>>>>>>>> initialized to '0'(because of the 'auto' type of the const variable)
>>>>>>>>>> and
>>>>>>>>>> cannot be changed in any of the following assignment statements to
>>>>>>>>>> the const
>>>>>>>>>> variable.
>>>>>>>>>>
>>>>>>>>>> 2.
>>>>>>>>>> Here for the structure struct s1 since the entire structure is
>>>>>>>>>> ending within 8 bytes no padding is done which means
>>>>>>>>>> s1: [char a]
>>>>>>>>>> 1byte
>>>>>>>>>> but for the structure struct s2 consider the following:
>>>>>>>>>> s2: [ char a
>>>>>>>>>> 1byte
>>>>>>>>>> ------ int a-------
>>>>>>>>>> ------4bytes----]
>>>>>>>>>> so here the concept of padding comes to make all the variable
>>>>>>>>>> aligned in even boundaries and so the structure after aligning will
>>>>>>>>>> look as:
>>>>>>>>>> s2: [ ------ char b----
>>>>>>>>>> ------4byte-----
>>>>>>>>>> ------ int a-------
>>>>>>>>>> ------4bytes----]
>>>>>>>>>>
>>>>>>>>>> so the size of strcut s2 will be 8bytes..........
>>>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> **Regards
>>>>>>>> SAGAR PAREEK
>>>>>>>> COMPUTER SCIENCE AND ENGINEERING
>>>>>>>> NIT ALLAHABAD
>>>>>>>>
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>>>>>>
>>>>>>
>>>>>> --
>>>>>> **Regards
>>>>>> SAGAR PAREEK
>>>>>> COMPUTER SCIENCE AND ENGINEERING
>>>>>> NIT ALLAHABAD
>>>>>>
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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Nikhil Gupta
>>>>> Senior Co-ordinator, Publicity
>>>>> CSI, NSIT Students' Branch
>>>>> NSIT, New Delhi, India
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Nikhil Gupta
>>>> Senior Co-ordinator, Publicity
>>>> CSI, NSIT Students' Branch
>>>> NSIT, New Delhi, India
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>>
>>
>> --
>> Nikhil Gupta
>> Senior Co-ordinator, Publicity
>> CSI, NSIT Students' Branch
>> NSIT, New Delhi, India
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**Regards
SAGAR PAREEK
COMPUTER SCIENCE AND ENGINEERING
NIT ALLAHABAD
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