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

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