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