How to resolve the algorithm Case-sensitivity of identifiers step by step in the Logtalk programming language

Published on 12 May 2024 09:40 PM
#Logtalk

How to resolve the algorithm Case-sensitivity of identifiers step by step in the Logtalk programming language

Table of Contents

Problem Statement

Three dogs (Are there three dogs or one dog?) is a code snippet used to illustrate the lettercase sensitivity of the programming language. For a case-sensitive language, the identifiers dog, Dog and DOG are all different and we should get the output: For a language that is lettercase insensitive, we get the following output:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Case-sensitivity of identifiers step by step in the Logtalk programming language

Source code in the logtalk programming language

:- object(three_dogs_or_one).

    :- public(test/0).

    test :- 
        fill_dogs(DOG, Dog, DoG),
        write_message(DOG, Dog, DoG).

    % Note: this predicate would actually fail if variables weren't case sensitive...
    fill_dogs('Benjamin', 'Samba', 'Bernie').

    % Note: ...as a result there is no way for this clause to ever succeed.
    write_message(A, A, A) :-
       format('There is one dog named ~w.~n', [A]).

    write_message(A, B, C) :-
       A \= B, B \= C, A \= C,
       format('There are three dogs named ~w, ~w, and ~w.~n', [A, B, C]).

:- end_object.

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