CSC 172 
Homework 1

Assigned Sept. 11, due Sept. 18, to be done in two-person teams

• As you go, or when you're done, fill out a time log form in our PSP package (click on "Input" under "Time Management Data").

For this assignment, there's probably not much purpose in keeping a defect log or making an estimate in advance.
• Copy the "Posn" version 5 BlueJ project into your own folder or floppy-disk and make sure it works as is.
• Modify the source code with a variety of intentional errors: misspelled variable names, misspelled method names, misspelled type names, missing left parenthesis, missing right parenthesis, extra parentheses, missing semicolon in statement, missing or extra curly-braces, and anything else you think up.  For each one, press the "Compile" button and copy down what error message you got.  (Then un-do the error and make sure it compiles successfully again before you try another error!) E-mail me the list of error messages, along with what you did to cause each one.
• Copy the "FunWithStrings" BlueJ project into your own folder or floppy-disk and make sure it works as is.
• Write down a bunch of Java expressions and statements, predict their results, and test them by inserting uses of them into the "test" method of the "FunWithStrings" class (use "Posn" version 5 as a model for writing such a "test" method). Your collection of examples should include all of the following:
• Data types: int, boolean, double, String.
• Arithmetic Operators: +, -, *, /, %, =, <, <=, ==.
• Built-in String methods (you may need to look up some of these in the on-line documentation.  Hint: these are methods for the String class, which is part of the java.lang package.):
• toUpperCase
• toLowerCase
• length
• equals
• compareTo
• concat
• substring
• indexOf
• Other built-in methods: System.out.println, System.out.print.
• Statement types: declaration, assignment, and method-call.
How to turn this in: Once you've got all your examples in the "test" method, compile the program, right-click on the "FunWithStrings" class box, and select the "test()" method.  It should create a terminal window showing the output from your method.  From the "Options" menu in this terminal window, choose "Save to File..." and save the contents of the window.  Then send me an e-mail, attaching this file and your modified FunWithStrings.java file.  The body of the e-mail should be a brief description of what you've learned about these methods and operators, noting especially any results you got that differed from what you expected.