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It's a set of C Preprocessor macros, so you don't even need to somehow process the code—you just #include the header and hack away as if it was regular C!

Preprocessor of sorts. From the readme:

The goals for Pretty C are:

- Provide so much syntactic sugar as to cause any C developer a diabetes-induced heart attack.

- Deprecate Lua, Python, JavaScript, Ruby and a dozen other languages, because Pretty C is the ultimate scripting language, but lightning-fast and strongly typed!

- Including only one header (yes, Pretty C is a header-only library #include-able from arbitrary C file!) to turn any codebase into a beginner friendly one.

It’s not a preprocessor or compiler. There’s no binary. It’s just a bunch of C code in a header: macros, functions, etc. that you can use to write different looking programs but that are still C.