How to avoid structure padding in C?
- 8 Answers
- 51982 Views
- Tech Mahindra, I also Faced
- E-Mail Answers
Answer Posted / lokesh mogra
yes u can use pragma to change change byte alignment.
for e.g.
typedef struct _s1{
unsigned int i;
unsigned char c;
unsigned long a;
unsigned short e;
} s1;
Size of this structure is of 11 Bytes. but due to default
byte alignment(8 byte) which is different for different
compilers. The size of structure would be 16 Bytes.
In order to change the alignment, we will have to do
something like this.
#pragma pack(push,1)
typedef struct _s1{
unsigned int i;
unsigned char c;
unsigned long a;
unsigned short e;
//unsigned char b;
} s1;
#pragma pack(pop)
This will change the byte alignment to 1 Byte. and thus size
of structure will be exactly 11 bytes
| Is This Answer Correct ? | 49 Yes | 11 No |
Post New Answer View All Answers
How can I open a file so that other programs can update it at the same time?
Why do we use int main?
Who is the main contributor in designing the c language after dennis ritchie?
‘SAVEPOINT’ and ‘ROLLBACK’ is used in oracle database to secure the data comment. Give suitable examples of each with sql command.
What is the best style for code layout in c?
What is the purpose of void pointer?
What is #include cctype?
What is the general form of function in c?
What is an auto variable in c?
What would happen to X in this expression: X += 15; (assuming the value of X is 5)
why to assign a pointer to null sometimes??how can a pointer we declare get assigned with a garbage value by default???
What is bss in c?
Can we declare function inside main?
What is putchar() function?
Explain c preprocessor?
