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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>fopen</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="fopen.html">fopen</a>  </div>  <div class="name-format">    fopen  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;stdio.h&gt;  FILE *fopen( const char *fname, const char *mode );</pre>  <p>The fopen() function opens a file indicated by <em>fname</em> and  returns a stream associated with that file. If there is an error,  fopen() returns <strong>NULL</strong>. <em>mode</em> is used to  determine how the file will be treated (i.e. for input, output,  etc)</p>  <table class="code-table">    <tr>      <th class="code-table-th">Mode</th>      <th class="code-table-th">Meaning</th>    </tr>    <tr>      <td class="code-table-td">&quot;r&quot;</td>      <td class="code-table-td">Open a text file for reading</td>    </tr>    <tr>      <td class="code-table-td">&quot;w&quot;</td>      <td class="code-table-td">Create a text file for writing</td>    </tr>    <tr>      <td class="code-table-td">&quot;a&quot;</td>      <td class="code-table-td">Append to a text file</td>    </tr>    <tr>      <td class="code-table-td">&quot;rb&quot;</td>      <td class="code-table-td">Open a binary file for reading</td>    </tr>    <tr>      <td class="code-table-td">&quot;wb&quot;</td>      <td class="code-table-td">Create a binary file for writing</td>    </tr>    <tr>      <td class="code-table-td">&quot;ab&quot;</td>      <td class="code-table-td">Append to a binary file</td>    </tr>    <tr>      <td class="code-table-td">&quot;r+&quot;</td>      <td class="code-table-td">Open a text file for read/write</td>    </tr>    <tr>      <td class="code-table-td">&quot;w+&quot;</td>      <td class="code-table-td">Create a text file for read/write</td>    </tr>    <tr>      <td class="code-table-td">&quot;a+&quot;</td>      <td class="code-table-td">Open a text file for read/write</td>    </tr>    <tr>      <td class="code-table-td">&quot;rb+&quot;</td>      <td class="code-table-td">Open a binary file for read/write</td>    </tr>    <tr>      <td class="code-table-td">&quot;wb+&quot;</td>      <td class="code-table-td">Create a binary file for      read/write</td>    </tr>    <tr>      <td class="code-table-td">&quot;ab+&quot;</td>      <td class="code-table-td">Open a binary file for read/write</td>    </tr>  </table>  <p>An example:</p>  <pre class="example-code">   int ch;   FILE *input = fopen( &quot;stuff&quot;, &quot;r&quot; );   ch = getc( input );          </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="fclose.html">fclose</a><br>    <a href="fflush.html">fflush</a><br>    <a href="fgetc.html">fgetc</a><br>    <a href="fputc.html">fputc</a><br>    <a href="fread.html">fread</a><br>    <a href="freopen.html">freopen</a><br>    <a href="fseek.html">fseek</a><br>    <a href="fwrite.html">fwrite</a><br>    <a href="getc.html">getc</a><br>    <a href="getchar.html">getchar</a><br>    <a href="setbuf.html">setbuf</a>  </div>  </div>  </td>    </tr>  </table></body></html>
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