CSC 160
Homework 7

Assigned Mar 30, due Apr 8

Pair Programming

As before, you are encouraged to do this assignment in a two-student team, following the principles of Pair Programming.

Problems

Problems marked "for practice" don't need to be turned in, but I recommend doing them to your own satisfaction before doing the next "real" problem.

• Exercise 20.4.2 (is a specified posn above the diagonal? For practice)
• Exercise 20.4.4 (difference between coordinates of a posn; for practice)
• Exercise 20.4.5 (distance between two posns)
• Exercise 20.4.6 (are two posns equal? ; for practice)
• Exercise 20.4.7 (how far is a number-or-posn from its origin? ; for practice)
• Exercise 20.5.2 (swap-x-y)
• Exercise 20.5.3 (scale-posn)
• Exercise 20.5.4 (add-posns)
• Exercise 20.5.7 (choose-posn)
• Exercise 20.6.3-4 (reaction-time video game; the "Congratulations!" part is extra credit)
• One of exercises 20.6.5-20.6.9 (animations; more than one is extra credit)
• Exercise 20.7.2 (an animation with color control)
• Exercise 20.7.3 (color=?) (oops: color=? is predefined)
• Exercises 20.7.5 and 20.7.6 (re-do exercises from section 7.8; for practice)
• Exercise 20.7.7 (replace-green-white)
• Exercises 21.3.1 through 21.3.4 (defining structs)
• Exercise 21.3.8 (define time-of-day struct)
• Exercises 21.4.2 through 21.4.5 (functions on structs; for practice)
• Exercises 21.4.10-12 (functions on structs)

What to turn in and how

As usual, for programming problems, I want to see all the steps of the recipe, except that in the course of writing a function body, you normally replace the "..." that was in the function skeleton. I recommend putting all of the programming problems in one big Definitions pane, because some of them depend on others.

For all the animation problems, please include a check-with clause.

It's difficult for me to grade your testing of these functions, but be assured that I will test them, and if they don't work, it'll hurt your grade, so it's to your advantage to test them before turning them in.

Send me an e-mail, attaching the file containing your saved Definitions pane. (Make sure to save it, then test it, then e-mail it to me, or I may end up grading an out-of-date version.) Make sure to put your name in the Subject line!

If there's a particular function that you can't get working, turn in as many steps of the recipe as you've managed to do, commented out (so they don't mess up the other functions).

Also turn in a log of how many errors of different kinds you encountered in the assignment, with brief comments describing each one ("mismatched parentheses" is self-explanatory, but more complex errors might need more description). Note that "errors" means not only error messages from DrScheme, but also wrong answers. You may do this using the PSP forms, or simply by keeping track in a text file or on paper and turning it in.

Grading standards

In order to get you feedback quickly, I won't actually grade all of these problems; the rest should be considered practice.

Error log:       25 points
(I'm not grading on how many or how few errors you encountered, only on whether you recorded them correctly.)

The table below has columns for each step in the design recipe, and a row for each function that I decide to grade. You won't turn in a separate skeleton, inventory, and body, but rather write a skeleton and then add inventory and body to turn it into a complete definition. However, if you don't get the definition working, you'll still get partial credit for a correct contract, skeleton, and/or inventory.

General skills:

Total:         /???