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please help me in this program

please help me in this program

(OP)

i ve got a problem with this program, is about a robot which can move one position right (MR) in a 4x4 table. movements left(ML) down(MD) or up(MU) are not allowed.The pr_move is the position that came from, move is the position tha we want to go right(MR).x is the row that is the row and y is the coloumn. it cant move diagonial. Iwant the function to  have 2 arguments , the first is the move that i would like to move(MR, ML,MU) and the second is a list. The list has 3  atoms the first is the previous move (pr_move) that came from, the second is x the row the third is y the coloumn.
the below code has problems it cant runs.. if someone could help me i woul appreciate it.

(defun move_robot (move  '(pr_move x y))
  (cond ((eq move 'ML)  'NO_MOVE)
    ((eq move 'MU)  'NO_MOVE)
    ((eq move 'MD)  'NO_MOVE)
    ((eq move 'MR) (princ (list pr_move x (+ y 1))))
               

)
)


(move_robot (read) '((read) (read) (read)))

RE: please help me in this program

I don't understand right, what the function should do, but this works:

mv.lsp

CODE

(defun move_robot (move pr_move x y)
  (cond ((eq move 'ML)  (princ 'NO_MOVE))
        ((eq move 'MU)  (princ 'NO_MOVE))
        ((eq move 'MD)  (princ 'NO_MOVE))
        ((eq move 'MR)  (princ (list pr_move x (+ y 1))))))

(move_robot 'MR 'STARTING_POINT 1 3)
The output is:

CODE

$clisp mv.lsp
(STARTING_POINT 1 4)

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