smart_calculator.rb

module SmartCalculator
  PI = 3.14159265359

  def sum(a, b)
    a + b
  end

  def multiply(a, b)
    a * b
  end

  def divide(a, b)
    a / b
  end

  def exponentiation(a, b)
    a ** b
  end

  def radiciation(a, b)
    a ** (1.0/b)
  end
end