defmodule SampleModule do
  @doc """
  Sum a and b

  ## Examples

      iex> SampleModule.sum(1, 1)
      2

  """
  def sum(a, b), do: a + b

  @doc """
  Subtracts a and b

  ## Examples

      iex> SampleModule.sub(1, 1)
      0

  """
  def sub(a, b), do: a - b
end