Spy's Space Worldbuilding Calculator

I'm a beginner at C++ so this project is very roughshod and clunky. I got tired of using seven different specific online calculators for different things and doing the harder stuff by hand, so I slapped all of the formulas I use in building solar systems into one branching-path calculator tool. I actually started this project years ago in my intro to C++ class, but for a long time I couldn't figure out how to get a system-based compiler to work. Thank goodness for this browser-based compiler!

I didn't realize at first that I could login with Google so I started this file on the site as an anonymous user, but this is in fact my own work. Run the program here: https://onecompiler.com/cpp/3xw2sbyke
I use this a lot though, so please promise not to mess with the code? Thanks. :]