CSSE 120 — Introduction to Software Development

Homework 7

Reminder: for each class session and associated homework:

You do the Reading Quiz on Angel.
You do all other work in Eclipse in the project that you checked out for that session.
You turn in your Eclipse work by committing that project:
- Right-click on the project name in the Package Explorer view.
- Select Team ~ Commit
- In the message box that appears, put a message to yourself if you wish (eventually, these messages will be for your teammates) and press OK.

Complete the FIRST PART of the assigned reading for the next session, Zelle sections 5.6-5.10.
- That's Chapter FIVE (5) — we are skipping ahead and will come back to Chapter 4 (on Objects) next.
(15 pts) Complete the ANGEL quiz over this reading. You'll find this on the course ANGEL page, under Lessons → Homework → Homework 7 → Files and Functions
Complete the SECOND PART of the assigned reading for the next session, Zelle sections 4.1-4.9.
- That's Chapter FOUR (4) — now we are coming back to Chapter 4 (on Objects).
- IMPORTANT: Much of Chapter 4 has details that you should just skim, returning to the text for reference when you need those details. For example, all of Section 4.8 is in this category — just skim that section briefly and return to it as needed for reference.
- Our zellegraphics package replaces the author's graphics package. There are some differences, which we will highlight when the time comes.
(24 Points) Complete the Angel quiz over this reading. You'll find this on the course Angel page,
under Lessons → Homework → Homework 7 → Graphics and Objects
(20 points: 5 for writeStuffToFile, 5 for readAndPrintMyself, and 10 for writeCosinesToFile)
Complete the above functions from the following module that you may have began in class: 3-files.py, from the 07-FilesAndFunctions project.
- Instructions are in the module.
- Simply do the TODO's in the module, in the order listed (1, 2, 3, ...).
- You can navigate to the TODO's easily if you do
```
   Window ~ Show View ~ Tasks
```
(10 points: Optional Challenge Problem: writeFunctionValuesToFile)
This one is way cool and not really hard — the last quiz question from today's session featured the same idea. Give it a try!

Complete the writeFunctionValuesToFile function in the following module: 3-files.py, from the 07-FilesAndFunctions project.
- This problem is exactly the same as the writeCosinesToFile function in the previous problem, except:
  - The writeCosinesToFile function has NO parameter and writes a table of COSINE values.
  - The writeFunctionValuesToFile function has ONE parameter that is the name of a FUNCTION.
  - The writeFunctionValuesToFile function writes a table of values using the function that it is given (instead of always using the cosine function like writeCosinesToFile does).
  So, the following call to writeFunctionValuesToFile :
```
    writeFunctionValuesToFile(math.cos)
```
  will produce exactly the same thing as writeCosinesToFile, but this function call:
```
    writeFunctionValuesToFile(math.sin)
```
  will write sine values to the file! And you can use any univariate function of numbers that you like! Wow!
- Hint: you might study the problem that you did as your last quiz question in this session. We have typed that problem for you into the 4-functions.py module, from the 07-FilesAndFunctions project.