exercism/elixir/grains/lib/grains.ex

15 lines
484 B
Elixir

defmodule Grains do
@doc """
Calculate two to the power of the input minus one.
"""
@spec square(pos_integer()) :: {:ok, pos_integer()} | {:error, String.t()}
def square(number) when number > 64 or number < 1, do: {:error, "The requested square must be between 1 and 64 (inclusive)"}
def square(number), do: {:ok, 2 ** (number - 1)}
@doc """
Adds square of each number from 1 to 64.
"""
@spec total :: {:ok, pos_integer()}
def total, do: {:ok, 2 ** 64 - 1}
end