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Constants are values which may be used but not changed by the program.

== Defining Constants ==
In {{OOo}} Basic, use the keyword <tt>Const</tt> to declare a constant.

<source lang="oobas">
Const A = 10
</source>

You can also specify the constant type in the declaration:

<source lang="oobas">
Const B As Double = 10
</source>

== Scope of Constants ==

Constants have the same scope as variables (see [[Documentation/BASIC Guide/Scope of Variables|Scope and Life Span of Variables]]), but the syntax is slightly different. A <tt>Const</tt> definition in the module header is available to the code in that module. To make the definition available to other modules, add the <tt>Public</tt> keyword.

<source lang="oobas">
Public Const one As Integer = 1
</source>

== Predefined Constants ==

{{OOo}} Basic predefines several constants. Among the most useful are:
*<tt>True</tt> and <tt>False</tt>, for Boolean assignment statements
*<tt>PI</tt> as a type <tt>Double</tt> numeric value

<source lang="oobas">
Dim bHit as Boolean
bHit = True

Dim dArea as Double, dRadius as Double
' ... (assign a value to dRadius)
dArea = PI * dRadius * dRadius
</source>

{{PDL1}}

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