Actual size of the above structure is 3 bytes(lets say int is 2 bytes).Code:struct student { int a; char c; }s1;
Is the declaration of above structure is correct or not as I didn't add any padding bytes?
Is the structure padding the compiler dependent?
You should not add padding bytes, let the compiler deal with that. It will decide where to put the padding so that your variables are correctly aligned on 2, 4 or 8 byte boundaries depending on the compiler/OS you are working with.
BTW... if ints in your compiler actually are 2 bytes, you seriously need to look into updating. The code it produces won't run on a 64 bit operating system.
Thank u very much tater....
It's fine, you don't have to pad yourself unless you have a reason to do so.Originally Posted by karthik537
Yes. With most compilers, you can also ask for no padding. Eg, with gcc:Is the structure padding the compiler dependent?
Will ensure the struct is exactly sizeof(int) + sizeof(char).Code:struct student { int a; char c; #pragma pack(1) }s1;
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
