%El paradigma de software lógico se basa en la lógica matemática. 
%En lugar de una sucesión de instrucciones, contiene un conjunto de principios que se pueden entender 
%como una recopilación de hechos y suposiciones

%hecho
is_palindrome([]).

%hecho
is_palindrome([_]).

%regla
is_palindrome(List) :-
  reverse(List, List). %verifica si la lista es la misma al revés. 

:- initialization(main).
main :-
  test_palindrome([1,2,3,2,1]),
  test_palindrome([a,b,c,b,a]),
  test_palindrome([1,2,3,4,5]),
  
  halt.
  
test_palindrome(List) :-
  write(List), 
  (is_palindrome(List) -> write('Es palindrome'), nl; write('No es palindrome'),nl).
by

Prolog online compiler

Write, Run & Share Prolog code online using OneCompiler’s Prolog online compiler for free. It’s a simple and intuitive platform to experiment with logic programming in Prolog. OneCompiler supports standard Prolog syntax, great for learning, prototyping, and practicing logic-based problems.

About Prolog

Prolog (Programming in Logic) is a logic programming language associated with artificial intelligence and computational linguistics. It works through facts, rules, and queries, using a form of symbolic reasoning known as backward chaining. Prolog is declarative, meaning you describe what you want instead of how to compute it.

Sample Code

The following is a simple Prolog program that prints a greeting:

:- initialization(main).

main :-
    write('Hello, World!').

Syntax Basics

Facts

Facts represent basic assertions about the world.

likes(alice, pizza).
likes(bob, pasta).

Rules

Rules define logical relationships using facts.

friends(X, Y) :- likes(X, Z), likes(Y, Z).

Queries

Queries are used to find information based on facts and rules.

?- likes(alice, What).

Operators

OperatorDescription
:-Rule definition
,Logical AND
;Logical OR
=Unification

Lists

member(X, [X|_]).
member(X, [_|T]) :- member(X, T).

Recursion

Prolog heavily relies on recursion.

factorial(0, 1).
factorial(N, F) :-
  N > 0,
  N1 is N - 1,
  factorial(N1, F1),
  F is N * F1.

This guide provides a quick reference to Prolog programming syntax and features. Start writing Prolog code using OneCompiler’s Prolog online compiler today!