Referenced from lesson Player Animation

Directions: The player moves up and down by 20 pixels each time. 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 (_____________ _________)__________)

(EXAMPLE (_____________ _________)__________)

(EXAMPLE (_____________ ___________)__________)

(EXAMPLE (_____________ ___________)__________)

Definition

Write the definition, giving variable names to all your input values…​

(define (_____________ ______)

__(____

_____[___________________ _________]

_____[_____________________ _________]

_____[____ __]

__))

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, and 1738598). CCbadge Bootstrap:Algebra by Emmanuel Schanzer, Jen Poole, Ed Campos Jr, Flannery Denny, and Dorai Sitaram is licensed under a Creative Commons 4.0 Unported License. Based on a work at www.BootstrapWorld.org. Permissions beyond the scope of this license may be available by contacting schanzer@BootstrapWorld.org.