Simple calculator app to test developing GUI apps on vintage Windows versions (Windows 98).

Don't use this as a real calculator... it overflows and only supports addition. Implementing a correct calculator isn't the purpose of this project.

Developing

This uses modern development tools and methods to produce vintage software. I use my standard workflow (CLion, Docker, Linux, cli).

This does have some drawbacks:

• Thewindows.h and various other header files provided by MinGW to provide the Win32 API is more modern than what is available in Windows 98. It is possible to use a function that does not exist, and this is not determined until the .exe is run on the target Windows 98 when dynamically linking.
• Parts of the MinGW C library are statically linked into the .exe, making it larger that it would otherwise be. This is still a WIP on using more native, dynamically linked objects on the target Windows 98 if possible.

The code must also be able to compile on the target OS too (see below for building on Windows 98). Todo: use more native Windows compilers (Visual C++).

Building

This uses Docker/Linux to build the Windows .EXE. These methods all use MinGW [1], [2].

./dev/build

(Manual) Linux

Check the Dockerfile for what is needed to build and run make.

(Manual) Windows 98

The project was originally created using Dev-C++ 5. The actual installer is v4.9.9.2, but it's called V5 on the homepage.

Either:

1. Open the rcalc.dev project file and compile using the GUI
2. Use the bundled mingw environment under c:\DEV-CPP and run make -f Makefile.win in a command shell.