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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>setf</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++ I/O</a> &gt; <a href="setf.html">setf</a>  </div>  <div class="name-format">    setf  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;fstream&gt;  fmtflags setf( fmtflags flags );  fmtflags setf( fmtflags flags, fmtflags needed );</pre>  <p>The function setf() sets the <a href=  "../io_flags.html#format_flags">io stream format flag</a>s of the  current stream to <em>flags</em>. The optional <em>needed</em>  argument specifies that only the flags that are in both  <em>flags</em> and <em>needed</em> should be set. The return value is  the previous configuration of <a href=  "../io_flags.html#format_flags">io stream format flag</a>s.</p>  <p>For example:</p>  <pre class="example-code">   int number = 0x3FF;   cout.setf( ios::dec );   cout &lt;&lt; &quot;Decimal: &quot; &lt;&lt; number &lt;&lt; endl;   cout.unsetf( ios::dec );   cout.setf( ios::hex );   cout &lt;&lt; &quot;Hexadecimal: &quot; &lt;&lt; number &lt;&lt; endl;               </pre>  <p>Note that the preceding code is functionally identical to:</p>  <pre class="example-code">   int number = 0x3FF;   cout &lt;&lt; &quot;Decimal: &quot; &lt;&lt; number &lt;&lt; endl &lt;&lt; hex &lt;&lt; &quot;Hexadecimal: &quot; &lt;&lt; number &lt;&lt; dec &lt;&lt; endl;                </pre>  <p>thanks to <a href="../io_flags.html#manipulators">io stream  manipulator</a>s.</p>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="flags.html">flags</a><br>    <a href="unsetf.html">unsetf</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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