Bonjour Heroes.
I took up this challenge at face value. I built an interactive calculator from scratch, in my own way. I use a lot of layers to organize the project and my mind. You click on a button, a layer opens, does what it has to do and closes. And so on. I'm not sure it's any simpler than other construction methods (but a bit simpler all the same to find the messy trigger among all the triggers). It was hard-hard-hard-hard work for a non-mathematician like me. Last night, I shouted "It works!" like Professor Frankenstein seeing his living creature for the first time. :-) There's certainly a lot of things for improvement. So, after all, what's the point? A converter.
https://360.articulate.com/review/content/4289be34-f5fa-4ca7-9ae3-0ea5a9d3bbcd/review