Op 29-3-2012 16:37, David Van Horn schreef:
;; Posn -> Number. ;; A programm for calculating the distance is Manhatten (check-expect (manhatten (make-posn 7 3 )) 10) (check-expect (manhatten (make-posn 1 1 )) 2)(define (manhatten pos-manhatten)(+ (posn-y pos-manhatten) (posn-x pos-manhatten)))
Thanks, Learning point : To take nire care about the (). Roelof ____________________ Racket Users list: http://lists.racket-lang.org/users
