constant
constant — A programming or system constant.
Synopsis
constant ::= ![[-]](figs/web/nav/down.gif)
- Zero or more of:
- text
replaceable- Graphic inlines
- Indexing inlines
- Linking inlines
- Ubiquitous inlines
abbrevacronymaltanchorannotationbibliorefcorefdateemphasis(db._emphasis)firstterm(db._firstterm)footnotefootnoterefforeignphrase(db._foreignphrase)glossterm(db._glossterm)indexterm(db.indexterm.endofrange)indexterm(db.indexterm.singular)indexterm(db.indexterm.startofrange)inlinemediaobjectlinkolinkphrase(db._phrase)quote(db._quote)remarksubscriptsuperscripttrademarkwordaswordxref
Description
A constant identifies a value as immutable. It
is most often used to identify system limitations or other defined
constants.
Processing expectations
Formatted inline.
Attributes
- class
Identifies the class of constant
Enumerated values: “limit” The value is a limit of some kind
Parents ![[+]](figs/web/nav/right.gif)
This element occurs in 54 elements.
Children
This element contains 29 elements.
See Also
command, computeroutput, literal, markup, option, optional, parameter, prompt, replaceable, tag, userinput, varname
Examples
<article xmlns='http://docbook.org/ns/docbook'> <title>Example constant</title> <para>In ACL, <constant>main::PCS</constant> contains the path component separator character. </para> </article>
In ACL, main::PCS contains the path component
separator character.
<article xmlns='http://docbook.org/ns/docbook'> <title>Example constant</title> <para>The maximum legal length for a path name is <constant class='limit'>PATH_MAX</constant>, defined in <filename class='headerfile'>limits.h</filename>. </para> </article>
The maximum legal length for a path name is
PATH_MAX, defined in
limits.h.