Fibonacci no recursive.rb

class Fibonacchi

  def initialize(path = "./input")
    File.open(path, "r") do |file|  
      file.each_line do |line|
      puts fibonacchi(line.chomp.to_i)
      end
    end
  end  

private 

  def fibonacchi(number)
    fib = [0, 1]
    while number > fib.count do
      fib << fib[fib.count - 1] + fib[fib.count - 2]
    end 
    fib.last
  end  
end

Fibonacchi.new

input

100