CSci 1301: Problem Set 3

Please make sure that every function has a signature, description, and test cases (as needed).

Exercise 51 (12 points). The world state for this problem is the enumeration "green", "yellow", "red".
Exercise 108 (12 points) . There are different possibilities for the world state here. A convenient one is a number between 0 and 20 (think carefully about why it can't be just a number between 0 and 9).
World problem with 4 coordinates (12 points). Design and implement the world that contains a player and an apple. The player can be moved by the four arrow keys: "up", "down", "left", "right". The apple starts at the top of the canvas at a random x coordinate and keeps falling at a constant speed. The goal of the game is to make the player catch the apple before it hits the ground.
The world state is a structure with four fields: the x,y coordinates of the player and x,y coordinates of the apple.
Use stop-when to stop the game when the apple touches the ground or when the player catches the apple (so that the coordinates of the center of the apple and the center of the player are close enough to each other).
You may use just dots of different colors for the player and the apple. You may also use images.
Implement the functionality one step at a time: first the apple movement on clock tick, then the player movement by arrows, and finally the stop-when condition (with helper functions, as needed) to stop the game. Write tests for the functions that you are implementing.