1: extern int circlemod1 (void);
    2: extern int circlemod2 (void);
    3: 
    4: int
    5: circlemod3 (void)
    6: {
    7:   return 3;
    8: }
    9: 
   10: int
   11: circlemod3a (void)
   12: {
   13:   return circlemod1 () + circlemod2 ();
   14: }