Hi Pritam, On Wed, Jul 25, 2012 at 4:01 AM, Pritam Bankar <pritambankar1988@gmail.com> wrote:

Hi,

AFAIK there are three programming model that can be chosen on 64 bit environment. These models are LP64, ILP64, LLP64

Question 1) But how can I know which model is used on my system ?

Write a little program to print the sizes of the various types which distinguish the models. Something like: #include <stdio.h> int main(int argc, char **argv) { printf("sizeof(int) = %zu\n", sizeof(int)); printf("sizeof(long) = %zu\n", sizeof(long)); printf("sizeof(void *) = %zu\n", sizeof(void *)); return 0; } which, when run on my 64-bit system produces: sizeof(int) = 4 sizeof(long) = 8 sizeof(void *) = 8 which according to http://www.unix.org/version2/whatsnew/lp64_wp.html makes it an LP64 model.

Question 2) Does long long data type is limited for LLP64 type model ?

I think that their table means that its 64 bits for all. -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com