fib_seq.rb

class FibSequence
  def initialize
    @first = 0
    @second = 1
  end

  def find_fib(n)
    i = 2
    print @first.to_s + " "
    print @second.to_s + " "
    while i <= n.to_i 
      sum = @first + @second
      @first = @second
      @second = sum
      i += 1
      print sum.to_s + " "
    end
    sum
  end
end

fib = FibSequence.new
puts "\nYour Fib number is #{fib.find_fib(5)}"