Hi, I'm trying to use gcc in darwin os-x. I've written the following piece of code: Times New Roman int main(int argc, char *argv[]) { unsigned long long int u; u = 1<<<<63; printf("u: %ld uu: %ld\n", u, u-1); printf("maxint %ld\n", INT64_MAX); } What compiler/linker options should I use with gcc? What format should I use with printf? Nick infinity software