A collection of small educational apps.

Some guiding principles for the apps are:

  • They are for practicing, not for replacing teachers.
  • You work in short intensive sprints.

Existing apps

  • How to write numbers in Danish.
  • Single digit addition.
  • Long addition.
  • Subtracting numbers up to ten.

Planned apps

  • Practice the correspondence between how you write numbers with digits, and how you say/write them with letters.
  • Long subtraction.

Building and testing


  • Bash
  • GNU Make
  • GNU Parallel (or xargs)
  • GNAT
  • Mercurial (hg)
  • Perl

Build and test the collection on a Unix platform:

OS_VERSION=unix make test

Build and test the collection on a Microsoft platform:

OS_VERSION=windows make test

The copyright to the software belongs to JSA Research & Innovation. The software is distributed under the Beer Ware License (revision 42): wrote this. As long as you retain this notice you can do whatever you want with this stuff. If we meet some day, and you think this stuff is worth it, you can buy me a beer in return.

If you want to find free Ada tools or libraries, AdaIC is an excellent starting point. You can also take a look at my other source text repositories or my web site.