File: factorial_epp

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erlang 1%3A25.2.3%2Bdfsg-1%2Bdeb12u3
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#!/usr/bin/env escript
%% -*- erlang -*-

-module(factorial).
-export([main/1]).

-define(PREFIX, ?MODULE_STRING).

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

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