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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>perror</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 I/O</a> &gt; <a href=    "perror.html">perror</a>  </div>  <div class="name-format">    perror  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;stdio.h&gt;  void perror( const char *str );</pre>  <p>The perror() function prints <em>str</em> and an  implementation-defined error message corresponding to the global  variable <em>errno</em>.  For example:</p>  <pre class="example-code">  char* input_filename = "not_found.txt";  FILE* input = fopen( input_filename, "r" );  if( input == NULL ) {    char error_msg[255];    sprintf( error_msg, "Error opening file '%s'", input_filename );    perror( error_msg );    exit( -1 );  }</pre>  <p>The the file called <em>not_found.txt</em> is not found, this  code will produce the following output:</p>  <pre class="example-output">  Error opening file 'not_found.txt': No such file or directory</pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="clearerr.html">clearerr</a><br>    <a href="feof.html">feof</a><br>    <a href="ferror.html">ferror</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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