A/I

Want to enable root logon in Ubuntu 12.04? Well, even though it’s not recommended, it’s still possible to login with the root or administrator account, and this brief tutorial is going to show you how

#include "stdlib.h" #include "stdio.h" #define MACRO_FUN(a) \ ({ \ printf("a=%x\n",a); \ }) int main() { MACRO_FUN(15); return 0; } the output: a=f