File: factorial_compile

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erlang 1%3A27.3.4.1%2Bdfsg-1
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#!/usr/bin/env escript
-mode(compile).

main([In]) ->
    X = list_to_integer(In),
    N = fac(X),
    io:format("factorial ~w = ~w~n",[X, N]).

fac(0) -> 1;
fac(N) ->
    N * fac(N-1).