Due date: 3/10 @ 4:30 pm

This problem set covers abstraction and "loops".

HtDP Problems:

19.1.5, 20.2.4 (also see 20.2.2)

The additional problems cover abstraction from the perspective of a game program.

Problem Background:

In a "bumper cars" game, cars randomly move around the screen and bump into other cars. Visually, a car is a red square. The natural data representation of a car is a Posn and Number; the position represents the cars's top-most point and number represents its side length.

For full credit, use Scheme loops for the final definitions of these functions. Recall that you do not have to use loops for the first draft. Programming is like writing; editing and improving the essay is everything.

Problem 1:

Design the function autos-create, which consumes a natural number and produces a list of Autos randomly placed in a 300 x 300 grid.

Problem 2:

Design the function autos-move. It consumes a list of Autos and produces one. The purpose is to move each Auto randomly on a 300 x 300 scene by 3 pixels per tick of the clock.

Problem 3:

Design the function collisions?, which consumes a list of Autos and returns a list of Autos that have collided with at least one other Auto.

Optional:

Please explain any problems you had completing this assignment in no more than 30 words.