This is a collection of solutions to exercises found in Learn Prolog Now! textbook by Patrick Blackburn, Johan Bos, and Kristina Striegnitz.

The book is available online:

http://www.learnprolognow.org/lpnpage.php?pageid=online

However, the authors forgot to include solutions to exercises into the free version of the book, so this my effort is to correct the mistake.

I know that paper version of the book contains the solutions, but I don't possess it and cannot check my solutions.

I also know that there is a blog post that has a link to a zip archive that supposedly contains the solutions as well. 'Anyone is welcome to use them for self-checking' - its author says. However, these files are in proprietary, secret .doc format, so I took that as a personal offense.

There is this repository on GitHub. Initially I thought that it's a good collection of solutions. Then I actually read them and concluded that programming skill of the author was insufficient. I opened an issue to point out that his solutions have flaws. The author admitted that those solutions are old and 'should be treated with proper caution'.

There is this repository. What's wrong with it? Well, it's poorly structured, it has unnecessary 'notes' in separate directory, in directory 'exercises' there are solutions to only first 6 chapters (and they are terribly incomplete).

There are other repositories on GitHub. I like this one. However, the files don't contain descriptions of exercises and some solutions can be more elegant. Worst of all, this repository doesn't have license, so one cannot know what he/she can do with it. Also, some solutions are still missing. But anyway it's way better than the others.

So, in this repository I've collected properly organized, elegant solutions to all exercises and practical sessions. I encourage you to send a pull request if you know better way to solve some exercise. This repository is here to help those who learn the language improve their skills by looking at the best possible solutions.

All solutions, commentaries, and other materials have been placed into public domain by their author, Mark Karpov.