CWEB is a computer programming system created by Donald Knuth and Silvio Levy as a followup to Knuth s WEB literate programming system, using the C programming language (and to a lesser extent the C plus plus programming language) instead of Pascal (programming language).

Like WEB, it consists of two primary programs: ctangle , which produces compilable C code from the source texts, and cweave , which produces nicely-formatted printable documentation using TeX.

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