Examine each expression. If it is valid, then list the type of the
expression. If it is invalid, simply list invalid. Use the struct and
declarations below as part of the program. Remember, pointer and
"address of" are not types.



struct Timer {
  int TimerID;
  double duration;
  Timer *next;
};

Timer t1;
Timer *p1 = new Timer;
int accel;
float mass;


Example:   &accel
Answer:   pointer to int 

 1. accel
 2. mass
 3. &mass
 4. *mass
 5. t1
 6. p1
 7. &t1
 8. &p1
 9. *t1
10. *p1
11. t1->next
12. t1.next
13. p1->next
14. p1.next
15. p1->TimerID
16. t1->TimerID
17. p1.duration
18. t1.duration
19. &*t1
20. *&t1