941014-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

int f (int a, int b) { }

main ()
{
  unsigned long addr1;
  unsigned long addr2;

  addr1 = (unsigned long) &f;
  addr1 += 5;
  addr2 = 5 + (unsigned long) &f;

  if (addr1 != addr2)
    abort ();
  exit (0);
}