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alco/ipow.ex

Last active December 22, 2015 01:58
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ipow.ex
defmodule IntMath do
def pow(_, 0), do: 1
def pow(a, 1), do: a
def pow(a, n) when rem(n, 2) === 0 do
tmp = pow(a, div(n, 2))
tmp * tmp
end
def pow(a, n) do
a * pow(a, n-1)
end
end
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