triangle.rb

class TriangleError < StandardError
end

# 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)
  
  	if ([a,b,c].min <= 0)
  		raise TriangleError
	end
	temp = [a,b,c].sort
	if temp[0] + temp[1] <= temp[2]
		raise TriangleError
	end

  if (a == b) && (b == c)
	return :equilateral
  end 
  if (a == b) || (b == c) || (a == c) || (b == c)
	return :isosceles
  else
  	return :scalene	
  end

end

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