Word Problem: update-player

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, and returns the new y-coordinate.

Contract and Purpose Statement

Every contract has three parts…​

; MMMMMMMMMMMMM:MMMMMMMMMMMMMM->MMMMMM

; M

Examples

Write some examples, then circle and label what changes…​

(EXAMPLE (MMMMMMMMMMMMM MMMMMMMMM)MMMMMMMMMM)

(EXAMPLE (MMMMMMMMMMMMM MMMMMMMMM)MMMMMMMMMM)

(EXAMPLE (MMMMMMMMMMMMM MMMMMMMMMMM)MMMMMMMMMM)

(EXAMPLE (MMMMMMMMMMMMM MMMMMMMMMMM)MMMMMMMMMM)

Definition

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

(define (MMMMMMMMMMMMM MMMMMM)

MM(MMMM

MMMMM[MMMMMMMMMMMMMMMMMMM MMMMMMMMM]

MMMMM[MMMMMMMMMMMMMMMMMMMMM MMMMMMMMM]

MMMMM[MMMM MM]

MM))

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, and 1738598). CCbadge BS:Games by Jen Poole, Emmanuel Schanzer, Ed Campos Jr, 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.