Example Cage

Jan Burse, created Mar 14. 2019
* Prolog code for the module mutual recursion example.
* Modules cage in a file.
* Growth of an idealized rabbit population, according
* to Liber Abaci from 1202 by Leonardo of Pisa, known
* as Fibonacci.
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:- package(library(example04)).
:- module(cage, [year/1]).
:- use_module(nest).
adults(0, 1) :- !.
adults(N, X) :-
N > 0,
M is N-1,
adults(M, Y),
babies(M, Z),
X is Y+Z.
year(X) :-
adults(12, X).
% ?- year(X).
% X = 233