CIS 554 -- Prolog Quiz Name __________________________________

  1. (2 points) Write a Prolog predicate last that you can use to find the last element of a list. It declares that the second parameter is the last element of the list given as the first parameter. The predicate should fail if given an empty list. (Hint: two clauses.)




  2. (1 point) Call your last predicate to find the last element in the list [a, b, c].


  3.  (1 point) What will be the value of X after you call your function as last(X, c).  ?


  4. (1 point) Help the prisoner to escape!
       dynamic locked/1.
       locked(cell_door).
       escape :- locked(cell_door), !, write('You are locked in!'), nl, fail.
       escape :- write('You are free!'), nl.
    Do it by completing the following clause:

         pick_lock :-

  5. (1 point) Briefly define the term "homoiconic."




  6.  (1 point) Turn the following into logical (not Prolog) clause form:
    female(X) ∧ rich(X) ⇒ loves(john, X).



  7.  (1 point) Circle the logical statements that, when turned into clause form, require a Skolem function:

         ∀x∀y, p(x, y)      ∀x∃y, p(x, y)      ∃x∀y, p(x, y)      ∃x∃y, p(x, y)

  8. (1 point) How do you indicate a "commit point" in Prolog?

  9. (1 point) State the resolution principle.