CSC 270

panther% hw1
+ 15 4
15 + 4 = 19
panther% hw1
- 8 19
8 - 19 = -11
panther% hw1
* 6 -3
6 * -3 = -18
panther%

Grading: Most important is whether the program works.

The user interface is also important. It should be easy to use, yet not get in the way. Output should be clear and readable, but not too verbose. Errors should be handled gracefully and informatively, not by crashing, going into infinite loops, or printing incorrect answers.

I'll also give a good deal of weight to programming style, including the following points:

• using meaningful variable names
• using blank lines and indentation appropriately
• using comments appropriately
• using symbolic constants appropriately
• avoiding duplicate code

Things you can add for extra credit:

• a help command
• operators / and % -- note that you'll need to detect and handle division by zero
• a loop around the whole thing, so the user can type an expression, see the answer, then type another expression and see the answer without restarting the program. The user should be able to end the program by typing 'q' or something like that.
• other neat things you'd like to try

I recommend that you develop this program in stages. First write a very simple program that does only a small part of the assignment. Get it working. Then modify it so it does a little more of what you want it to. Get this working. And so on until it does everything you want it to do, with all the extra credit features, or until the assignment is due, whichever comes first.