# (koans) uninitialized constant TriangleError

Hello,

I have to make a exception part on triangles now.

The exercise looks like this : [/code]

# You need to write the triangle method in the file ‘triangle.rb’

require ‘triangle.rb’

# Let’s handle that part now.

def test_illegal_triangles_throw_exceptions assert_raise(TriangleError) do triangle(0, 0, 0) end assert_raise(TriangleError) do triangle(3, 4, -5) end assert_raise(TriangleError) do triangle(1, 1, 3) end assert_raise(TriangleError) do triangle(2, 4, 2) end # HINT: for tips, see geometry - Ruby Koan 151 raising exceptions - Stack Overflow end end [/code]

So I looked at that page and come with this solution :

``````def triangle(a, b, c)

raise TriangleError, "length cannnot be 0 or lesser" if (a <= 0) or (b <= 0) or (c <= 0);
raise TriangleError, "length does not mach Pyschotorogas" if (a * a + b * b != c * c);

return :equilateral if ((a == b) and (b == c))
return :isosceles if (((a == b) and (b != c)) or
((a != b) and (b == c)) or
((a == c) and (a != b)))
return :scalene  if ((a !=b) and (b != c))
end``````

But now I get a uninitialized constant TriangleError

What did I do wrong now ?

Roelof

Hello,

I found this solution :