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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>#undef</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">C/C++ Pre-processor Commands</a> &gt; <a href=    "undef.html">#undef</a>  </div>  <div class="name-format">    #undef  </div>  <p>The #undef command undefines a previously defined macro variable,  such as a variable defined by a <a href=  "define.html">#define</a>.</p>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="define.html">#define</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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