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.


struct Pass {
  int id;
  double secs;
  Pass *next;
};

Pass pass1;
Pass *passptr = new Pass;
int apple;
float orange;


Example:   &apple
Answer:   pointer to int 

 1. apple
 2. orange
 3. pass1.id
 4. pass1.secs
 5. pass1->id
 6. pass1->secs
 7. passptr.id
 8. passptr.secs
 9. passptr->id
10. passptr->secs
11. &apple
12. &orange
13. &passptr
14. *pass1
15. *passptr
16. &pass1
17. passptr->next
18. passptr->next->next
19. passptr->next->id
20. &(passptr->next)