calc.exe is now open source; there's surprising depth in its ancient code
Microsoft's embrace and adoption of open source software has continued with the surprising decision to publish the code for Windows Calculator and release it on GitHub under the permissive MIT license.
The repository shows Calculator's surprisingly long history. Although it is in some regards one of the most modern Windows applications—it's an early adopter of Fluent Design and has been used to showcase a number of design elements—core parts of the codebase date all the way back to 1995.
(Score: 2, Offtopic) by turgid on Saturday March 09 2019, @11:11AM
Many years ago I started to write a GUI calculator using WINGs (the toolkit that WindowMaker comes with). As with everything else, life got in the way and I never finished it.
I refuse to engage in a battle of wits with an unarmed opponent [wikipedia.org].