class Exponate
  attr_accessor :args

  def initialize args = {}
    @args = args
    @ans = nil
  end

  def index
    @args[:b].times {
      @ans = @args[:a] * @args[:a]
    }
    puts @ans
  end
end

e = Exponate.new(:a => 32, :b => 6)
e.index

e.args[:a] = 5
e.index

1024     # Should be 1_073_741_824
25       # Should be 15_625