Because Github was buyed by microsoft its not safe anymore and can collect data.
There are 3 alternatives:
Bitbucket should be free pricing,codeberg is totally free and gitlab is for money.
Thats should help you will write own function from this formula:
For visualization you need this...
Install dependencies by sudo apt build-dep vice and and if you want use cmake use sudo apt install cmake-gui.
You can bulid it with cmake or ordinary make.
Download source code: https://netcologne.dl.sourceforge.net/project/vice-emu/releases/vice-3.7.tar.gz
Unpack it with your archiver on...
Im recomending that site https://en.duolingo.com/
Many languages available in many languages just change site language.
Creating acount and usage is free then you can learn everyday.
Pros: fast easy free site with many things to learn
Cons: Duolino app is not free also for learning you...
So there is alternative to closed source of compilers for C,C++,D,Objective C,Go,Rust,Fortran.
You should not pay for them so there list:
1.GDC its a free D compiler for every platform by platform im mean computer architecture so os and cpu.
Its a simple and powerfull...