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    Preprocessor Commands    [C++ Reference]
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<h2><a name="preprocessor_commands" id="preprocessor_commands">Preprocessor Commands</a></h2>
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The C++ preprocessor runs before any other compilation happens.  Commands given to the preprocessor allow the programmer to define variables, perform text substitution, and test simple conditions.

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		<td class="col0"><a href="../preprocessor/sharp.html" class="wikilink1" title="preprocessor:sharp"># and ##</a></td><td class="col1">manipulate strings</td>
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		<td class="col0"><a href="../preprocessor/define.html" class="wikilink1" title="preprocessor:define">#define</a></td><td class="col1">define macrodefinition</td>
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		<td class="col0"><a href="../preprocessor/error.html" class="wikilink1" title="preprocessor:error">#error</a></td><td class="col1">display an error message</td>
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		<td class="col0"><a href="../preprocessor/preprocessor_if.html" class="wikilink1" title="preprocessor:preprocessor_if">#if, #ifdef, #ifndef, #else, #elif, and #endif</a></td><td class="col1">conditional operators</td>
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		<td class="col0"><a href="../preprocessor/include.html" class="wikilink1" title="preprocessor:include">#include</a></td><td class="col1">insert the contents of another file</td>
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		<td class="col0"><a href="../preprocessor/line.html" class="wikilink1" title="preprocessor:line">#line</a></td><td class="col1">set line and file information</td>
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		<td class="col0"><a href="../preprocessor/pragma.html" class="wikilink1" title="preprocessor:pragma">#pragma</a></td><td class="col1">implementation specific command</td>
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		<td class="col0"><a href="../preprocessor/undef.html" class="wikilink1" title="preprocessor:undef">#undef</a></td><td class="col1">used to undefine macrodefinitions</td>
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		<td class="col0"><a href="../preprocessor/preprocessor_vars.html" class="wikilink1" title="preprocessor:preprocessor_vars">Predefined preprocessor variables</a></td><td class="col1">miscellaneous preprocessor variables</td>
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