COP 3337 Assignment 2 solution


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Write algorithm(s) and program(s) to display certain properties of a given
triangle — refer to P4.3 on page 172 in the text for the basics.

Output: Output will include all three Points, the lengths of all three sides, the three
angles at the corners, the perimeter and the area of the triangle, and whether the triangle
is Equilateral or Right-angled or neither — all in a nicely formatted layout, as directed.

Values displayed will be labeled and designated in the appropriate “units”, angles will
be displayed in “degrees”. All printed values will be rounded and formatted to four
decimal-point accuracy, degrees rounded to the nearest degree.

Input: Program will prompt a user to provide x- and y-coordinates for the three Points of
a triangle. User input must be validated.

User prompts must clearly indicate how to enter
values for each Point (which is: a pair of x- and y-coordinates, separated by a <return>).
A coordinate is a floating-point value and can be positive, negative or zero.


Use only material covered in the first six chapters – no arrays, no exceptions.
Style requirements as discussed in class expected. Efficiency should always be considered.
Round only for output. Choose the most appropriate loop/decision structures and variable
types. No graphics.

Provide a Triangle class with only the appropriate constructor(s), methods and instance
variables. Triangle class can only have three instance variables — for the three Points.
Provide appropriate constants where useful. Provide appropriate accessor and mutator methods,
as well as any required utility methods to compute values not stored in the class instance

Also provide a separate Tester program (main) to prompt the user for the three Points, request
the required values from the Triangle class, and then provide the display of the required
output. All input/output will be handled by the Tester. See section 4.1 (pages 136-138)
for hints on building class and tester programs. Test your programs completely and be sure
your Tester tests all methods of your Triangle class!

The links: and may contain some useful triangle
formulas. The link: may provide some
other triangle insights.

Use of the “Point” class is required – Appendix D (A17-18) in the text — java.awt.geom —
along with page 67, may prove useful for Points.


Your program must be able to compile and execute on FIU SCIS, using the “java”
compiler. Test it there before you submit.

Name your primary source code file: and your class source code file: . Only two source code files.

Refer to the Moodle documents: “How to Develop a Simple Java Program” and “Style Guide”
for details on expected program format and documentation. Review both documents carefully!
Note the class source code file will use the class heading documentation, the tester (main)
source code file will use the program heading documentation.

Algorithm (pseudocode) should be submitted for each program and in separate text files and
included with the Moodle posting and class submission.

Print out a copy of your primary source code, class source code and pseudocode and submit
in class — signed, stapled and collated in the specified sequence: primary source code (w/main)
file, class source code file and then the pseudocode text files.

Post a .zip file — with all source code (.java) and text files — on the Moodle web site.
Do not include any extraneous (IDE) files in the Moodle submission.

Program documentation must include the required signed disclaimer (comment) in the
heading — no grade will be assigned to programs that omit the disclaimer or signature.

Sample Session:
Enter the x,y coordinates of three points in this order (x1,y1) (x2,y2) (x3,y3)
Separate each coordinate with a <return>:

Point 1 coordinates: (0.0000, 0.0000)
Point 2 coordinates: (2.0000, 0.0000)
Point 3 coordinates: (0.0000, 2.0000)

Side 1 length: 2.0000 units
Side 2 length: 2.8284 units
Side 3 length: 2.0000 units

Angle 1: 90 degrees
Angle 2: 45 degrees
Angle 3: 45 degrees

The perimeter of the triangle is 6.8284 units
The area of the triangle is 2.0000 square units
The triangle is Equilateral?: False
The triangle is Right-angled?: True

Extra Credit:

Credit will only be given for extra credit completed correctly. Document in
your program heading that you have completed the extra credit, and be sure these extra methods
are called in your Tester program. See me for assistance with any details below that are
unclear or unfamiliar.

Include accessor (getter) methods that allow user access to the Incenter and Centroid points
of a triangle.