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<?xml version="1.0" encoding="UTF-8"?>
<helpdocument version="1.0">
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-->
<meta>
<topic id="textsbasicshared03040000xml">
<title id="tit" xml-lang="en-US">Basic Constants</title>
<filename>/text/sbasic/shared/03040000.xhp</filename>
</topic>
</meta>
<body>
<section id="basic_constants">
<bookmark xml-lang="en-US" branch="index" id="bm_id051720170831387233">
<bookmark_value>Pi;Basic constant</bookmark_value>
<bookmark_value>Null;Basic constant</bookmark_value>
<bookmark_value>Empty;Basic constant</bookmark_value>
<bookmark_value>Nothing;Basic constant</bookmark_value>
<bookmark_value>Basic constant;Nothing</bookmark_value>
<bookmark_value>Basic constant;Null</bookmark_value>
<bookmark_value>Basic constant;Empty</bookmark_value>
<bookmark_value>Basic constant;Pi</bookmark_value>
<bookmark_value>Basic constant;False</bookmark_value>
<bookmark_value>Basic constant;True</bookmark_value>
</bookmark>
<paragraph id="hd_id051620171022255424" role="heading" level="1" xml-lang="en-US"><link href="text/sbasic/shared/03040000.xhp">Basic Constants</link></paragraph>
<paragraph id="par_id051620171022384640" role="paragraph" xml-lang="en-US"><ahelp hid=".">Constants used in Basic programs</ahelp></paragraph>
</section>
<paragraph id="par_id051620171022382581" role="heading" level="2" xml-lang="en-US">Boolean constants</paragraph>
<table id="tbl_051620171030174631">
<tablerow>
<tablecell>
<paragraph id="par_id051620171114565335" role="tablehead" xml-lang="en-US">Name</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114565484" role="tablehead" xml-lang="en-US">Type</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114563271" role="tablehead" xml-lang="en-US">Value</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id051620171114567378" role="tablecontent" localize="false" xml-lang="en-US">True</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114563299" role="tablecontent" localize="false" xml-lang="en-US">Boolean</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114565603" role="tablecontent" localize="false" xml-lang="en-US">1</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id051620171114564178" role="tablecontent" localize="false" xml-lang="en-US">False</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114566455" role="tablecontent" localize="false" xml-lang="en-US">Boolean</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114563986" role="tablecontent" localize="false" xml-lang="en-US">0</paragraph>
</tablecell>
</tablerow>
</table>
<paragraph id="hd_id051620171114566623" role="heading" level="2" xml-lang="en-US">Example</paragraph>
<bascode>
<paragraph id="par_id051620171114567539" role="bascode" localize="false" xml-lang="en-US">Dim bPositive as Boolean</paragraph>
<paragraph id="par_id051620171114574976" role="bascode" localize="false" xml-lang="en-US">bPositive = True</paragraph>
</bascode>
<paragraph id="hd_id051620171114573549" role="heading" level="2" xml-lang="en-US">Mathematical constant</paragraph>
<table id="tbl_051620171031298215">
<tablerow>
<tablecell>
<paragraph id="par_id051620171114576150" role="tablehead" xml-lang="en-US">Name</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114575122" role="tablehead" xml-lang="en-US">Type</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114574987" role="tablehead" xml-lang="en-US">Value</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id051620171114574028" role="tablecontent" localize="false" xml-lang="en-US">Pi</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114571506" role="tablecontent" localize="false" xml-lang="en-US">Double</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114576361" role="tablecontent" localize="false" xml-lang="en-US">3.14159265358979</paragraph>
</tablecell>
</tablerow>
</table>
<paragraph id="hd_id051620171114571721" role="heading" level="2" xml-lang="en-US">Example</paragraph>
<bascode>
<paragraph id="par_id051620171114575849" role="bascode" localize="false" xml-lang="en-US">Function Rad2Deg( aRad as Double) As Double</paragraph>
<paragraph id="par_id051620171114575132" role="bascode" localize="false" xml-lang="en-US">Rad2Deg = aRad * 180.00 / Pi</paragraph>
<paragraph id="par_id051620171114571381" role="bascode" localize="false" xml-lang="en-US">End Function</paragraph>
</bascode>
<paragraph id="hd_id051620171114576454" role="heading" level="2" xml-lang="en-US">Object Constants</paragraph>
<table id="tbl_051620171033491648">
<tablerow>
<tablecell>
<paragraph id="par_id051620171114576921" role="tablehead" xml-lang="en-US">Name</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114578188" role="tablehead" xml-lang="en-US">Type</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051720170824099845" role="tablehead" xml-lang="en-US">Usage</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id051620171114575052" role="tablecontent" localize="false" xml-lang="en-US">Empty</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114576734" role="tablecontent" localize="false" xml-lang="en-US">Variant</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id05172017082409622" role="tablecontent" xml-lang="en-US">The <emph>Empty</emph> value indicates that the variable is not initialized.</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id051620171114577892" role="tablecontent" localize="false" xml-lang="en-US">Null</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051620171114571232" role="tablecontent" localize="false" xml-lang="en-US">null</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051720170824093395" role="tablecontent" xml-lang="en-US">Indicates that the variable does not contain data.</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id051720170824091253" role="tablecontent" localize="false" xml-lang="en-US">Nothing</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051720170824091966" role="tablecontent" localize="false" xml-lang="en-US">Object</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id051720170824097935" role="paragraph" xml-lang="en-US">Assign the <emph>Nothing</emph> object to a variable to remove a previous assignment.</paragraph>
</tablecell>
</tablerow>
</table>
<paragraph id="hd_id051620171114572289" role="heading" level="2" xml-lang="en-US">Example</paragraph>
<bascode>
<paragraph id="par_id051620171114575772" role="bascode" localize="false" xml-lang="en-US">SubExampleEmpty</paragraph>
<paragraph id="par_id051620171114572075" role="bascode" localize="false" xml-lang="en-US">Dim sVar As Variant</paragraph>
<paragraph id="par_id051620171114579662" role="bascode" localize="false" xml-lang="en-US"> sVar = Empty</paragraph>
<paragraph id="par_id051620171114577052" role="bascode" localize="false" xml-lang="en-US"> Print IsEmpty(sVar) ' Returns True</paragraph>
<paragraph id="par_id051620171114576576" role="bascode" localize="false" xml-lang="en-US">End Sub</paragraph>
<paragraph id="par_id051620171114573781" role="bascode" localize="false" xml-lang="en-US">Sub ExampleNull</paragraph>
<paragraph id="par_id051620171114584136" role="bascode" localize="false" xml-lang="en-US">Dim vVar As Variant</paragraph>
<paragraph id="par_id05162017111458231" role="bascode" localize="false" xml-lang="en-US"> MsgBox IsNull(vVar)</paragraph>
<paragraph id="par_id051620171114581488" role="bascode" localize="false" xml-lang="en-US">End Sub</paragraph>
<paragraph id="par_id051720170824102912" role="bascode" localize="false" xml-lang="en-US">Sub ExampleNothing</paragraph>
<paragraph id="par_id051720170824104202" role="bascode" localize="false" xml-lang="en-US">Dim oDoc As Object</paragraph>
<paragraph id="par_id051720170824102971" role="bascode" localize="false" xml-lang="en-US"> Set oDoc = ThisComponent</paragraph>
<paragraph id="par_id051720170824104997" role="bascode" localize="false" xml-lang="en-US"> Print oDoc.Title</paragraph>
<paragraph id="par_id051720170824104443" role="bascode" localize="false" xml-lang="en-US"> oDoc = Nothing</paragraph>
<paragraph id="par_id051720170824106132" role="bascode" localize="false" xml-lang="en-US"> Print oDoc ‘ Error</paragraph>
<paragraph id="par_id051720170824103527" role="bascode" localize="false" xml-lang="en-US">End Sub</paragraph>
</bascode>
</body>
</helpdocument>
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