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nihilismus's solution

to Hello World in the Prolog Track

Published at Sep 10 2020 · 0 comments
Instructions
Test suite
Solution

The classical introductory exercise. Just say "Hello, World!".

"Hello, World!" is the traditional first program for beginning programming in a new language or environment.

The objectives are simple:

  • Write a function that returns the string "Hello World!".
  • Run the test suite and make sure that it succeeds.
  • Submit your solution and check it at the website.

If everything goes well, you will be ready to fetch your first real exercise.

Source

This is an exercise to introduce users to using Exercism http://en.wikipedia.org/wiki/%22Hello,_world!%22_program

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

hello_world_tests.plt

% Please visit https://exercism.io/tracks/prolog/installation
% for instructions on setting up prolog.
% Visit https://exercism.io/tracks/prolog/tests
% for help running the tests for prolog exercises.

% The goal below allows tests to be skipped
% unless the "--all" flag is passed at
% the command line.

pending :-
    current_prolog_flag(argv, ['--all'|_]).
pending :-
    write('\nA TEST IS PENDING!\n'),
    fail.

:- begin_tests(hello_world).

    test(hello_world, condition(true)) :-
        hello_world('Hello World!').

    % Once the first test passes, un-skip the following test by
    % changing `pending` in `condition(pending)` to `true`.
    % Repeat for each test until they are all passing.

:- end_tests(hello_world).
hello_world('Hello World!').

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