main () {
  int a = 0;
  int b = 1;

  printf ("a == b: %d\n", a == b);
  printf ("a != b: %d\n", a == b);
  printf ("a < b: %d\n", a < b);
  printf ("a > b: %d\n", a > b);
  printf ("a <= b: %d\n", a <= b);
  printf ("a >= b: %d\n", a >= b);
}