Directions: The player moves by 20 pixels each time the up or down key is pressed. Write a function called update-player
, which takes in the player’s y-coordinate and the name of the key pressed ("up" or "down"), and returns the new y-coordinate.
Contract and Purpose Statement |
Every contract has three parts…
_____________:______________->______
_______________________________________________________________________
Examples |
Write some examples, then circle and label what changes…
(EXAMPLE (update-player 300 "up")__________)
(EXAMPLE (_____________ ________)__________)
(EXAMPLE (_____________ __________)__________)
(EXAMPLE (_____________ __________)__________)
Definition |
Write the definition, giving variable names to all your input values…
(define (_____________ ______)
__(cond__
_____[___________________ ________]_____[_____________________ ________]_____[____ _]
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