triangle.rb

# Triangle Project Code.

# Triangle analyzes the lengths of the sides of a triangle
# (represented by a, b and c) and returns the type of triangle.
#
# It returns:
#   :equilateral  if all sides are equal
#   :isosceles    if exactly 2 sides are equal
#   :scalene      if no sides are equal
#
# The tests for this method can be found in
#   about_triangle_project.rb
# and
#   about_triangle_project_2.rb
#
def triangle(a, b, c)
  result = :equilateral if a == b && b == c
  if (a < b)
  	result = :isosceles if (b * 3) > (a+b+c)
  else
  	result = :isosceles if (a * 3) > (a+b+c)
  end
  result = :scalene if a != b && b != c && a != c
  raise TriangleError if a == 0 || b == 0 || c == 0
  raise TriangleError if a < 0 || b < 0 || c < 0
  raise TriangleError if (a + b) <= c || (a + c) <= b || (b + c) <= a
  return result
end

# Error class used in part 2.  No need to change this code.
class TriangleError < StandardError
end