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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>isalnum</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">Standard C String and Character</a> &gt; <a href=    "isalnum.html">isalnum</a>  </div>  <div class="name-format">    isalnum  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;ctype.h&gt;  int isalnum( int ch );</pre>  <p>The function isalnum() returns non-zero if its argument is a  numeric digit or a letter of the alphabet. Otherwise, zero is  returned.</p>  <pre class="example-code">   char c;   scanf( &quot;%c&quot;, &amp;c );   if( isalnum(c) )     printf( &quot;You entered the alphanumeric character %c\n&quot;, c );              </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="isalpha.html">isalpha</a><br>    <a href="iscntrl.html">iscntrl</a><br>    <a href="isdigit.html">isdigit</a><br>    <a href="isgraph.html">isgraph</a><br>    <a href="isprint.html">isprint</a><br>    <a href="ispunct.html">ispunct</a><br>    <a href="isspace.html">isspace</a><br>    <a href="isxdigit.html">isxdigit</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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