Editing Web (programming system) (section)

==CWEB==
{{Infobox programming language
| name                   = CWEB
| paradigm               = [[Literate programming|Literate]], [[Imperative programming|imperative]] ([[Procedural programming|procedural]]), [[structured programming|structured]]
| released               = {{Start date and age|1987}}
| designer               = [[Donald Knuth]]
| developer              = [[Donald Knuth]] & [[Silvio Levy]]
| latest release version = 3.67
| latest release date    = {{Start date and age|2006|10|24}}
| typing                 = [[Type system|Static]], [[Weak typing|weak]], [[manifest typing|manifest]], [[Nominative type system|nominal]]
| influenced by          = [[WEB]], [[TeX]]
| influenced             = [[noweb]]
| operating system       = [[Cross-platform|Cross-platform (multi-platform)]]
| license                = custom [[free-software license]]
| file ext               = .w
| website                = {{URL|www-cs-faculty.stanford.edu/~uno/cweb.html}}
}}
'''CWEB''' is a [[computer programming]] system created by [[Donald Knuth]] and [[Silvio Levy]] as a follow-up to Knuth's ''WEB'' [[literate programming]] system, using the [[C (programming language)|C programming language]] (and to a lesser extent the [[C++]] and [[Java (programming language)|Java]] programming languages) instead of [[Pascal (programming language)|Pascal]].

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]].

===Features===
* Can enter manual TeX code as well as automatic.
* Makes formatting of C code suitable for [[pretty printing]].
* Can define sections, and can contain documentation and codes, which can then be included into other sections.
* Writes the header code and main C code in one file, and can reuse the same sections, and then it can be tangled into multiple files for compiling.
* Uses <code>#line</code> directive so that any warnings or errors refer to the .w source.
* Include files.
* Change files, which can be automatically merged into the code when compiling/printing.
* Produces index of identifiers and section names in the printout.