int main()
{
  int happy = rand(2);
  int know_it = rand(2);
  int i = 0;

  while (i++ < 3)
    if (happy & know_it)
      printf("*Clap* *Clap* *Clap*\n");

  if (happy & know_it)
    printf("I am%s happy%s\n",
           happy ? "" : " not",
           happy & know_it ? " and I know it!" : ".");

  if (happy & know_it)
    printf("*Clap* *Clap* *Clap*\n");

  return (happy & know_it);
}