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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