This program will take three numbers and tell you if it can be represented as a triangle and if so what kind of triangle.

triangle.rb

def triangle(number1, number2, number3)
  if number1 > number2 + number3 || number2 > number1 + number3 || number3 > number1 + number2
    "This is not a triangle"
  else
    if number1 == number2 && number2 == number3
      "You have got yourself an equalateral triangle.  You should try and be more creative."
    elsif number1 == number2 || number1 == number3 || number2 == number3
      'This is an isosceles triangle. So you got that there going for you.'
    elsif number1 != number2 && number2 != number3 && number3 != number1
      'Oh snap! That is a scalene'  
    end  
  end
end


puts "'#{triangle(2, 2, 10)}' should be 'That is not a triangle'"
puts "'#{triangle(10, 10, 10)}' should be 'You have got yourself an equalateral triangle.  You should try and be more creative.'"
puts "'#{triangle(2, 10, 10)}' should be 'This is an isosceles triangle. So you got that there going for you.'"
puts "'#{triangle(12, 7, 10)}' should be 'Oh snap! That is a scalene'"