University of Washington, CSE 142

Lab 5-5: midterm practice

lab document created by Marty Stepp, Stuart Reges and Whitaker Brand

Basic lab instructions

Mouse over highlighted words if you're not sure what they mean!
Talk to your classmates for help.
You may want to bring your textbook to future labs to look up syntax and examples.
Stuck? Confused? Have a question? Ask a TA for help, or look at the book or past lecture slides.
Complete as much of the lab as you can within the allotted time. You don't need to keep working on these exercises after you leave.
Feel free to complete problems in any order.
Make sure you've signed in on the sign-in sheet before you leave!

Today's lab

Goals for today:

practice problems in the same format as the midterm
find resources to help tackle exam problems

Exam Tips

Practice problems with pencil and paper. You will not be coding on a computer for the midterm. Many students find it extremely difficult to code on paper for the first time on exams.
Do not use "" around output (for example, in parameter mystery). But for expressions problems, make sure to put "" around Strings, and a decimal (ex. 2 ==> 2.0) for doubles. We require this to test your knowledge of what type an expression has.
Review the cheat sheet. It will have all the syntax you need, but you'll need to know how to use it.
No abbreviations/shorthand is allowed except for A/S/N for Always/Sometimes/Never in the assertions problem and S.o.pln() / S.o.p() for System.out.println() / System.out.print().
More information on the Exams tab of the course website!

Exercise : Expressions

For each expression in the left-hand column, indicate its value in the right-hand column. Be sure to list a constant of appropriate type (e.g., 7.0 rather than 7 for a double, Strings in quotes).

If you've forgotten how to tackle expressions problems, check out lab 2 for a recap!

Also, make sure you can evaluate boolean expressions.

`12/5 + 8/4`		4
`2.5 * 2 + 17/4`		9.0
`41 % 15 % 7 + 17 % 3`		6
`21/2 + "7 % 3" + 17 % 4`		"107 % 31"
`46/3/2.0/3 * 4/5`		2.0
`4 / 5 == 0 && 3 % 2 == 1`		true
`4 % 2 != 0 && 5 == 5`		false
`3 % 2 == 0 \|\| 6 / 3 != 4`		true

[an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive]

If you finish them all...

If you finish all the exercises, try out our Practice-It web tool. It lets you solve Java problems from our Building Java Programs textbook.

You can view an exercise, type a solution, and submit it to see if you have solved it correctly.

Choose some problems from the book and try to solve them!