Triangle Calculator Specification

Michael Bolton, 2017
Based on the Perl / Perl/TK version written by James Bach, in 2000
Based on an exercise in The Art of Software Testing, by Glenford Myers

Purpose

Specification

The program takes 3 positive numbers, each in its own field. When the check button is pressed, the program interprets the numbers as the lengths of the sides of a triangle, and displays one of the following in the output field:

• "Equilateral" (all sides of the triangle are equal)
• "Isosceles" (two of the sides are equal)
• "Scalene" (no side is equal to any of the others)

The program also helpfully checks to see if the specified numbers could possibly be a triangle. The three numbers can represent a triangle if and only if any two of the numbers add up to a length that is greater than the third number.

The triangle you specify is drawn inside the rectangle. It will be scaled so that it fits inside that area.