what is the use of #pragma pack, wer it is used?
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Answer / sarabjit kaur
#pragma is a miscelleneous directive which is used to turn
on or off certain features.
It varies frm compiler to compiler
a. #pragma startup and #pragma exit
used to specify which function should b called upon startup
(before main()) or program exit(just before program
terminates)
such funtions should nt receive or return any valur
b. #pragma -warn used to surpress specific warning
#pragma warn -rvl return value warnings surpressed
#pragma warn -par parameter not used warnings surpressed
#pragma warn -rch unreachable code warnings surpressed
| Is This Answer Correct ? | 2 Yes | 3 No |
Answer / ram
actually pragma pack is used for structure padding
we are having #pragma pack 0,#pragma pack 1,#pragma pack
2,#pragma pack 3,#pragma pack 4
in this first one will allocate memory 4 bytes for every
data type
in second one i.e in pack 1 it allocates 1 byte for every
data type
in third one i.e in pack 2 it allocates 2 bytes for every
data type
in fourth one i.e pack 3 it allocates 3 bytes for every data
type
in fifth one i.e pack 4 it allocates 4 bytes for every data type
Actually pragma will be used in powers of 2 only
| Is This Answer Correct ? | 3 Yes | 10 No |
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