6.090 IAP '05 - Homework 8 Solutions (MIT Munchkin)

Problem 1:

<Game playing here> - Sleeping through class increases sanity.

Problem 2:

change the won? procedure

;has the student won?
(define (won? student)
  (>= (student-value student "clue") 20))

Problem 3:

change the play-game procedure 

;play the game
; deck is the deck of cards yet to be drawn.  when empty,
; it reshuffles the discard list into the deck list.
; stud1 is the student next to play.
(define (play-game deck discard stud1 stud2)
  (if (null? deck)
      (play-game (randomize-list discard) nil stud1 stud2)
      (if (< (length (student-value stud1 "hand")) 3)   ;; changed this line
	  (play-game (cdr deck) (cons (car deck) discard)
		     (add-card-to-hand stud1 (car deck)) stud2)
	  (let ((newstud (turn stud1)))
	    (if (won? newstud)
		(format #t "~A wins!~%" (student-name newstud))
		(if (lost? newstud)
		    (format #t "~A loses~%" (student-name newstud))
		    (play-game (cdr deck)
			       (cons (car deck) discard)
			       stud2
			       newstud)))))))

Problem 4:

change the weapons-effect procedure

;sums the utilities of the list of weapons
(define (weapons-effect weapons)
  (if (null? weapons)
      0
      (max (weapon-utility (car weapons))   ; change + to max
	   (weapons-effect (cdr weapons)))))

Problem 5:

;;; chance cards

(define chance-tag "chance")

;constructor for chance cards - card name and change to student sanity
(define (make-chance-card name sanitymod)
  (list chance-tag name sanitymod))

;selector for card name
(define (chance-card-name card)
  (second card))

;selector for card sanity mod
(define (chance-card-sanitymod card)
  (third card))

;procedure to perform effect of card - returns a new student
; after applying effect
(define (chance-proc card student)
  (format #t "~%~A~%~A's sanity changes by ~A~%" (chance-card-name card)
	  (student-name student) (chance-card-sanitymod card))
  (student-update student "sanity"
		  (+ (chance-card-sanitymod card)
		     (student-value student "sanity"))))