CSC 160
Homework 6

Assigned Mar 20, due Apr 1

Pair Programming

As before, you are encouraged to do this assignment in a two-student team, following the principles of Pair Programming. If you've worked with the same partner for the last several assignments, see if you can find somebody different to work with: you'll both learn more that way.

There are 20 problems, but 9 of them are "practice" or "worked" exercises for which you don't need to turn anything in; just do them to make sure you're comfortable with the topics before trying to do the "turn-in" problems. You have 9 days, so that's roughly two problems per day, half of which are to be turned in. Start early!

Problems

Chapter 11: multi-function programs

• Exercise 11.3.5 ("Progressiva" tax code).
• Exercise 11.3.6: using the function(s) defined in exercise 11.3.5 to answer some questions
• Exercise 11.6.3: building images of text in various colors and font sizes

Chapter 13: Booleans

• Practice exercise 13.2.1: nothing to turn in, but please do this before going on.
• Download Worked Exercise 13.2.2, make sure it works for you, make some changes to it, and make sure they work too. (Nothing to turn in.)
• Exercises 13.2.3, 13.2.5 (is-nintendo?, in-first-half?)
• Do the examples at the beginning of section 13.3, make up some similar examples of your own, and see if they work (nothing to turn in.)
• Download Worked Exercise 13.3.1, make sure it works for you, make some changes to it, and make sure they work too. (Nothing to turn in.)
• Practice exercise 13.3.2 (nothing to turn in.)
• Exercises 13.3.4, 13.3.5 (under-a-dollar?, is-17?)
• Exercise 13.4.1 (much-older?)
• Practice exercise 13.6.1 (nothing to turn in.)
• Download Worked Exercise 13.7.1, make sure it works for you, make some changes to it, and make sure they work too. (Nothing to turn in.)
• Do the examples on page 188 (in worked exercise 13.7.1), make up some similar examples of your own, and make sure they work too. (Nothing to turn in.)
• Practice exercise 13.7.2 (nothing to turn in.)
• Exercises 13.7.6 and 13.7.7 (game of craps)
• Exercise 13.7.13 (any-two-same-pics?)

What to turn in and how

All of these are programming problems, except that 11.3.6 asks you to use the function you wrote in 11.3.5 to answer some other questions. I recommend putting all of the programming problems in one big Definitions pane, because some of them depend on others.

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(s) 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; I haven't decided yet which ones I'll grade, but it'll include some easy ones and some hard ones.

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:         /???