---

jupyter: jupytext: text_representation: extension: .md format_name: markdown format_version: '1.3' jupytext_version: 1.16.7 kernelspec: display_name: Logtalk language: logtalk name: logtalk_kernel ---

<!--

This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2025 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. -->

This folder contains a set of simple examples illustrating how to use the IC Constraint Solver library distributed with ECLiPSe with Logtalk.

These examples are adapted with permission from the examples found at:

http://www.eclipse-clp.org/examples

The examples code was changed to avoid using ECLiPSe special features (e.g., array notation or the do/2 loop operator) as they do not work when the iso library is loaded (this library is loaded by the eclipse*iso.pl adapter file, which is used in the Logtalk integration scripts and shortcuts).

The Constraint Solver libraries are loaded from the loader.lgt auxiliary loader file. These libraries must always be loaded prior to compilation of the individual example files.

We must define an alias for the ECLiPSe ic library operator (::)/2 in order to avoid conflicts with the (::)/2 Logtalk message-sending operator. In the examples, the operator ins/2 was chosen as the alias for the (::)/2 operator. ECLiPSE 6.0#78 adds an alias in_set_range/2 for (::)/2 that could also be used.

Print Logtalk, Prolog backend, and kernel versions (if running as a notebook):

%versions

Start by loading the example:

logtalk_load(clp_eclipse(loader)).

puzzle::sendmore1(Digits).

<!-- Digits = [9, 5, 6, 7, 1, 0, 8, 2]. -->

puzzle::sendmore2(Digits).

<!-- Digits = [9, 5, 6, 7, 1, 0, 8, 2]. -->

steiner::steiner(9,X).

<!-- X = [[1, 2, 3], [1, 4, 5], [1, 6, 7], [1, 8, 9], [2, 4, 6], [2, 5, 8], [2, 7, 9], [3, 4, 9], [3, 5, 7], [3, 6, 8], [4, 7, 8], [5, 6, 9]] ; X = [[1, 2, 3], [1, 4, 5], [1, 6, 7], [1, 8, 9], [2, 4, 6], [2, 5, 8], [2, 7, 9], [3, 4, 9], [3, 5, 7], [3, 6, 8], [4, 7, 8], [5, 6, 9]] ; X = [[1, 2, 3], [1, 4, 5], [1, 6, 7], [1, 8, 9], [2, 4, 6], [2, 5, 8], [2, 7, 9], [3, 4, 9], [3, 5, 7], [3, 6, 8], [5, 6, 9], [4, 7, 8]] ; (etc) -->

tomography::go.

<!-- 0 0 7 1 6 3 4 5 2 7 0 0 0 0 8 * * * * * * * * 2 * * 6 * * * * * * 4 * * * * 5 * * * * * 3 * * * 7 * * * * * * * 0 0

true. -->

zebra::zebra.

<!-- The japanese owns the zebra The norwegian drinks water

true. -->