German gross salary employer contributions calculator

Calculates German salary employer contributions for a gross number.

This program does not calculate employee contributions breakdown, only the employer part.

This is an Ada port of my Fortran implementation.

Setup for development on macOS

GNAT

1. Download GNAT from https://www.adacore.com/download/more.
2. Install in a directory you want. For example, I have installed it in /Users/rad/dev/GNAT/2020.
3. Add GNAT executables to PATH. I added the following line to the end of ~/.bash_profile:

export PATH=/Users/rad/dev/GNAT/2020/bin:$PATH

Note: use gprbuild tool instead of gnatmake. gprbuild operates on project files. Two online resources for GPRBuild tool:

• https://learn.adacore.com/courses/GNAT_Toolchain_Intro/chapters/gprbuild.html
• https://docs.adacore.com/gprbuild-docs/html/gprbuild_ug/introduction.html

Xcode

If you see an error like this when building Ada program on Mac:

ld: library not found for -lSystem
collect2: error: ld returned 1 exit status
gprbuild: link of main.adb failed

it is because you have no Xcode installed. GNAT requires Xcode so install it from the App Store. Before you can progress with the build, you'll have to gree to Xcode license:

sudo xcodebuild -license

Press return (enter) to display license text, then press q, finally type agree and press return again. Now, retry Ada program build. You should see output similar to:

AUnit: the Ada unit test framework

Tests require AUnit. I'm no expert, but to me it looks like dependencies have to be built for the target architecture and installed on the system. The easiest way to proceed with a dependency is to install it in the <GNAT-install-dir>/lib. For AUnit, the best way to proceed seems to be:

mkdir -p /tmp/aunit
cd /tmp/aunit
git clone https://github.com/AdaCore/aunit.git .
git checkout v22.0.0
make
make install

Build

make build

Run the program with ./bin/main.

Run tests

This is a two step process:

1. Compile tests programs.
2. Run resulting test harnesses.

make tests
./tests/bin/cli-tests-harness