Description
Introduction
For your third programming assignment, you’re going to implement a GUIbased calculator in Java using Swing. You should use Eclipse+Windowbuilder,
as discussed in class. You must use the Java JDK 1.8 or 1.9.
The design of the calculator is mostly up to you. There’s exibility in how it
looks and works; and there are options as far as the specs of what it is capable
of (see below).
Important Note: Do not use any online sources to look up code for a
calculator. There are a lot of tutorials and examples related to this type of
project. If you use any of these, you will not learn as much, and this will be
a problem down the road. Ask questions in class, on Canvas, or during o ce
hours. Stay away from Google and other sites, and try to work through the
di cult spots with trial and error, test code, and so on.
Requirements
Your program should display something like a standard calculator: buttons
0-9 for inputting numbers; operators including + – * / = and a display for
showing numbers as they’re entered as well as results. Output must use GUI
components: printing to stdout is not acceptable. Neither is doing non-GUI
things, even if they happen in a GUI (for example, displaying in a GUI Enter
rst number, hit enter when done and having the user type in a number and
then hit enter). If you’re in doubt about your design, ask.
Grading
This assignment is worth 100 points, and the maximum you can score is 100
points. You may choose how you wish to build up your grade, using the following
grading table:
1
• Documentation: the usual grading for comments, comment block in header,
etc: 10 points max
• Correct submission, meaning le names, method of exporting the zip le,
etc: 5 points
• Functional behavior and design: 85 points max, awarded as follows:
Basic frame looks like a calculator, has buttons and a display: 15
points
Buttons let you enter a number which is displayed properly: 20 points
+ – * / work correctly on integers: 30 points
Clear button (clears last entry): 5 points
Constants (e.g. 2+3=(displays 5) 6= (displays 8): 5 points
Works with real numbers (numbers containing a decimal point): 15
points
Scienti c functions (at least 4, e.g. sin, cos, sqrt, log, exp, etc): 5
points
Handles division by 0 in a reasonable way: 5 points
Resizable: everything still looks well-proportioned when you resize
the frame: 5 points
DEDUCTIONS
Doesn’t treat the 0 key correctly (e.g. hitting 007 displays 007
instead of 0): -5 points
(If you implement a decimal point): hitting double decimal points
causes numbers like 1..5: -5 points
Program crashes (throws an exception): -15 points
2
Sample Appearance
Here’s a sample of what your frame might look like (this is only an example):
Suggested Approach
We’ll discuss this in class.
Submission
Export your le from Eclipse as described in class, and upload the zip le to
Canvas by the deadline. Be sure to download your le into a clean directory
and import it as a new project into Eclipse (and then test it) to make sure
your submission is correct. This is not a simple zip le of your code: it’s an
Eclipse-speci c format, and must be created as described in class.