Études for Erlang

Solution 2-3

Here is a suggested solution for Étude 2-3.

geom.erl

%% @author J D Eisenberg <[e-mail]>
%% @doc Functions for calculating areas of geometric shapes.
%% @copyright 2013 J D Eisenberg
%% @version 0.1

-module(geom).
-export([area/2]).

%% @doc Calculates the area of a rectangle, given the
%% length and width. Returns the product
%% of its arguments.

-spec(area(number(),number()) -> number()).

area(L,W) -> L * W.