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<a name="doc_title"></a>Run-Time Functions</h1>
<p id="par_id3148983" class="paragraph" dir="auto">This section describes the Runtime Functions of LibreOffice Basic.</p>
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<h2 id="hd_id051620171022255424" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03040000.html">Basic Constants</a></h2>
<p id="par_id051620171022384640" class="paragraph" dir="auto"><span class="avis">Constants used in Basic programs</span></p>
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<h2 id="hd_id3149669" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03100000.html">Variables</a></h2>
<p id="par_id3147265" class="paragraph" dir="auto">The following statements and functions are for working with variables. You can use these functions to declare or define variables, convert variables from one type to another, or determine the variable type.</p>
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<h2 id="hd_id3147559" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03060000.html">Logical Operators</a></h2>
<p id="par_id3153379" class="paragraph" dir="auto">The following logical operators are supported by LibreOffice Basic.</p>
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<h2 id="hd_id3150682" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03110100.html">Comparison Operators</a></h2>
<p id="par_id3156042" class="paragraph" dir="auto">Comparison operators compare two expressions. The result is returned as a boolean expression that determines if the comparison is <span class="literal">True</span> (-1) or <span class="literal">False</span> (0).</p>
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<h2 id="hd_id3156153" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03120000.html">Strings</a></h2>
<p id="par_id3159176" class="paragraph" dir="auto">The following functions and statements validate and return strings.</p>
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<h2 id="hd_id3150502" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03030000.html">Date and Time Functions</a></h2>
<p id="par_id3153255" class="paragraph" dir="auto">Use the statements and functions described here to perform date and time calculations.</p>
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<h2 id="hd_id3149234" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03070000.html">Mathematical Operators</a></h2>
<p id="par_id3145068" class="paragraph" dir="auto">The following mathematical operators are supported in LibreOffice Basic.</p>
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<h2 id="hd_id3153127" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03080000.html">Numeric Functions</a></h2>
<p id="par_id3148550" class="paragraph" dir="auto">The following numeric functions perform calculations. Mathematical and Boolean operators are described in a separate section. Functions differ from operators in that functions pass arguments and return a result, instead of operators that return a result by combining two numeric expressions.</p>
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<h2 id="hd_id3156280" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03010000.html">Screen I/O Functions</a></h2>
<p id="par_id3153770" class="paragraph" dir="auto">This section describes the Runtime Functions used to call dialogs for the input and output of user entries.</p>
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<h2 id="hd_id3156344" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03020000.html">File I/O Functions</a></h2>
<p id="par_id3153360" class="paragraph" dir="auto">Use File I/O functions to create and manage user-defined (data) files.</p>
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<h2 id="hd_id3145136" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03090000.html">Controlling Program Execution</a></h2>
<p id="par_id3143268" class="paragraph" dir="auto">The following statements control the execution of a program.</p>
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<h2 id="hd_id3143271" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03050000.html">Error-Handling Functions</a></h2>
<p id="par_id3145068" class="paragraph" dir="auto">Use the following statements and functions to define the way LibreOffice Basic reacts to run-time errors.</p>
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<h2 id="hd_id3156027" dir="auto"><a target="_top" href="en-US/text/sbasic/shared/03130000.html">Other Commands</a></h2>
<p id="par_id3153312" class="paragraph" dir="auto">This is a list of the functions and the statements that are not included in the other categories.</p>
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