Directive (programming): Difference between revisions

Revision as of 08:31, 26 July 2019

Revision as of 19:50, 29 August 2019

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==Other languages==

* In [[Ada (programming language)|Ada]], compiler directives are called '''pragmas''' (short for "pragmatic information").

* In [[Common Lisp]], directives are called '''declarations''', and are specified using the <code>declare</code> construct (also <code>proclaim</code> or <code>declaim</code>).{{sfn|Steele|1990|loc=[httphttps://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node103.html Chapter 9: Declarations], p. 215–237}} With one exception, declarations are optional, and do not affect the semantics of the program. The one exception is <code>special</code>, which must be specified where appropriate.

* In [[Turbo Pascal]], directives are called '''significant comments''', because in the language [[grammar]] they follow the same syntax as [[comment (computer programming)|comment]]s. In Turbo Pascal, a significant comment is a comment whose first character is a [[dollar sign]] and whose second character is a letter; for example, the equivalent of C's <code>#include "file"</code> directive is the significant comment <code>{$I "file"}</code>.

* In [[Perl]], the [[keyword (computer programming)|keyword]] "<code>[http://perldoc.perl.org/functions/use.html use]</code>", which imports modules, can also be used to specify directives, such as <code>use strict;</code> or <code>use utf8;</code>.