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). 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.