• The core library
• The standard library
• The compiler front-end
• The unix library: Unix system calls
• The num library: arbitrary-precision rational arithmetic
• The str library: regular expressions and string processing
• The threads library
• The graphics library
• The dynlink library: dynamic loading and linking of object files
• The bigarray library

Chapter 28  The num library: arbitrary-precision rational arithmetic

The num library implements integer arithmetic and rational arithmetic in arbitrary precision. It was split off the core OCaml distribution starting with the 4.06.0 release, and can now be found at https://github.com/ocaml/num.

New applications that need arbitrary-precision arithmetic should use the Zarith library (https://github.com/ocaml/Zarith) instead of the Num library, and older applications that already use Num are encouraged to switch to Zarith. Zarith delivers much better performance than Num and has a nicer API.