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<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
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* This file is part of the LibreOffice project.
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* This Source Code Form is subject to the terms of the Mozilla Public
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* This file incorporates work covered by the following license notice:
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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<meta>
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<topic id="textsbasicshared03100700xml" indexer="include" status="PUBLISH">
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<title id="tit" xml-lang="en-US">Const Statement</title>
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<filename>/text/sbasic/shared/03100700.xhp</filename>
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</topic>
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</meta>
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<body>
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<section id="const">
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<bookmark xml-lang="en-US" branch="index" id="bm_id3146958">
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<bookmark_value>Const statement</bookmark_value>
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</bookmark>
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<h1 id="hd_id3146958" xml-lang="en-US"><variable id="const_h1"><link href="text/sbasic/shared/03100700.xhp">Const Statement</link></variable></h1>
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<paragraph id="par_id3154143" role="paragraph" xml-lang="en-US">Defines one or more identifiers as constants.</paragraph>
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</section>
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<paragraph id="par_id3147264" role="paragraph" xml-lang="en-US">A constant is a variable that helps to improve the readability of a program. Constants are not defined as a specific type of variable, but rather are used as placeholders in the code. You can only define a constant once and it cannot be modified.</paragraph>
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<embed href="text/sbasic/shared/00000003.xhp#functsyntax"/>
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<paragraph role="image" id="par_id831588865616326">
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<image src="media/helpimg/sbasic/Const_statement.svg" id="img_id651588865616326"><alt id="alt_id281588865616326">Const syntax</alt></image>
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</paragraph>
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<bascode>
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<paragraph id="par_id3150984" role="bascode" xml-lang="en-US">[Global|Private|Public] Const name = expression[, ...]</paragraph>
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</bascode>
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<embed href="text/sbasic/shared/00000003.xhp#functparameters"/>
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<paragraph id="par_id3153897" role="paragraph"> <emph>name:</emph> Any identifier that follows the standard variable naming conventions.</paragraph>
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<paragraph role="paragraph" id="par_id791593689338208"><emph>expression:</emph> Any literal expression. </paragraph>
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<paragraph id="par_id3150400" role="paragraph" xml-lang="en-US">The data type must be omitted. When a library gets loaded in memory, %PRODUCTNAME Basic converts the program code internally so that each time a constant is used, the defined expression replaces it.</paragraph>
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<h3 id="hd_id51593690561479">Scope</h3>
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<paragraph role="paragraph" id="par_id431593690612961">By default constants are defined as private in modules and routines. Constants can be made public or global in order to be used from all modules, from all Basic libraries.</paragraph>
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<paragraph role="paragraph" id="par_id241593693307830"><literal>Global</literal>, <literal>Private</literal> and <literal>Public</literal> specifiers can only be used for module constants.</paragraph>
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<embed href="text/sbasic/shared/00000003.xhp#functexample"/>
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<bascode>
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<paragraph role="bascode" id="bas_id911593692598060" xml-lang="en-US">Const EARTH = "♁" ' module scope</paragraph>
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<paragraph role="bascode" id="bas_id441593692601125" xml-lang="en-US">Private Const MOON = "☾" ' module scope</paragraph>
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<paragraph role="bascode" id="bas_id161593692601597" xml-lang="en-US">Public Const VENUS="♀", MARS="♂" ' general scope</paragraph>
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<paragraph role="bascode" id="bas_id581593692602046" xml-lang="en-US">Global Const SUN = "☉", STAR = "☆" ' general scope</paragraph>
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<paragraph role="bascode" id="bas_id711593692602477" localize="false"></paragraph>
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<paragraph id="par_idm1341161984" role="bascode" localize="false">Sub ExampleConst</paragraph>
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<paragraph id="par_idm1341160752" role="bascode" xml-lang="en-US"> Const SUN = 3 * 1.456 / 56 ' SUN is local</paragraph>
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<paragraph id="par_idm1341159520" role="bascode" xml-lang="en-US"> MsgBox SUN,, MOON ' SUN global constant is unchanged</paragraph>
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<paragraph id="par_id3153969" role="bascode" localize="false"> Const Pgm = "Program", Var = 1.00</paragraph>
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<paragraph id="par_idm1341156544" role="bascode" localize="false"> MsgBox Pgm & " " & Var, , VENUS &" and "& MARS</paragraph>
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<paragraph id="par_idm1341155296" role="bascode" localize="false">End Sub</paragraph>
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</bascode>
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<section id="relatedtopics">
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<paragraph role="paragraph" id="par_id111593694878677"><link href="text/sbasic/shared/enum.xhp">Enum</link> statement</paragraph>
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<paragraph role="paragraph" id="par_id111953694878677"><link href="text/sbasic/shared/03090413.xhp">Type</link> statement</paragraph>
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</section>
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</body>
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</helpdocument> |