James Gray
4/10/2007 12:12:00 PM
Begin forwarded message:
> From: "Rene Koning" <rene.koning@gmail.com>
> Date: April 10, 2007 5:52:08 AM CDT
> To: submission@rubyquiz.com
> Subject: PleaseForward: Ruby QuizSubmission
>
> My contribution to Quiz 119:
>
> class Operators
> OPS = ['','+','-']
> attr_reader :operators
>
> def initialize(size)
> @operators = [0] * size
> end
>
> def next_operator(n = 0)
> if @operators[n] < (OPS.size - 1)
> @operators[n] += 1
> else
> @operators[n] = 0
> next_operator(n + 1)
> end
> end
> end
>
> class Equation
> NUM = [1,2,3,4,5,6,7,8,9]
> attr_reader :string
>
> def initialize(operators)
> @string = NUM.zip(operators.operators.map { |o| Operators::OPS
> [o]}.flatten.compact).join('')
> end
>
> def answer
> eval(@string)
> end
> end
>
> tested = 0
> found = 0
> match = 100
>
> ops = Operators.new(Equation::NUM.size-1)
> (Operators::OPS.size**(Equation::NUM.size-1)-1).times do
> eq = Equation.new(ops)
> answer = eq.answer
>
> puts "************************" if answer == match
> puts "#{eq.string} = #{answer}"
> puts "************************" if answer == match
>
> ops.next_operator
> tested += 1
> found += 1 if answer == match
> end
>
> puts "#{tested} equations tested, #{found} evaluated to #{match}"
>