EarlOfBDE

-module perfect.
-export [test/0].
-export [is_perfect/1].

test() ->
    true = perfect:is_perfect(1),
    false = perfect:is_perfect(2),
    false = perfect:is_perfect(5),
    true = perfect:is_perfect(6),
    false = perfect:is_perfect(24),

EarlOfBDE

-module fibonacci_pieces.
-export [test/0].
-export [fib/1].
-export [pieces/1].

test() ->
    0 = fibonacci_pieces:fib(1),
    5 = fibonacci_pieces:fib(6),
    1 = fibonacci_pieces:pieces(0),
    2 = fibonacci_pieces:pieces(1),

EarlOfBDE

-module(variables_patterns).
-export([xORone/2,xORtwo/2,xORthree/2,maxThree/3,howManyEqual/3,testall/0]).

% @doc xORone performs an Exclusive OR using the inequality operator '=/='
xORone(X,Y) ->
    X =/= Y.

% @doc xORtwo performs an Exclusive OR using a negated equality operator
xORtwo(X,Y) ->
    not (X == Y).

EarlOfBDE

-module(first).
-export([double/1,mult/2,area/3,square/1,treble/1]).

mult(X,Y) ->
    X*Y.

square(X) ->
    mult(X,X).

double(X) ->