C/C++ literate programming system (Marc van Leeuwen's version)

 This version is a complete rewrite of Levy & Knuth's version of CWEB.
 It uses a slightly different syntax from the L&K version, but provides a
 compatibility mode allowing L&K CWEB sources to be processed, producing
 similar (though not necessarily identical) output.
 .
 CWEB allows you to write documents which can be used simultaneously as
 C/C++ programs and as TeX documentation for them.
 .
 The philosophy behind CWEB is that programmers who want to provide the best
 possible documentation for their programs need two things simultaneously: a
 language like TeX for formatting, and a language like C for programming.
 Neither type of language can provide the best documentation by itself. But
 when both are appropriately combined, we obtain a system that is much more
 useful than either language separately.