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    <title>modf</title>
    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
    <meta name="keywords" content="modf" />
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    <div class="refentry">
      <a id="id-1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="modf"></a>
        <h1>modf</h1>
        <p>
           Decompose a floating-point number.
        </p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    gentype
                    <strong class="fsfunc">                   
                        modf
                    </strong>
                (</code>
                <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="global.html" target="_top">__global</a> gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*iptr</var><code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    gentype
                    <strong class="fsfunc">                   
                        modf
                    </strong>
                (</code>
                <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="local.html" target="_top">__local</a> gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*iptr</var><code>)</code></td>
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              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    gentype
                    <strong class="fsfunc">                   
                        modf
                    </strong>
                (</code>
                <td>gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="private.html" target="_top">__private</a>  gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*iptr</var><code>)</code></td>
            </tr>
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        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            Decompose a floating-point number. The <code class="function">modf</code>
function breaks the argument <code class="varname">x</code> into integral and
fractional parts, each of which has the same sign as
the argument. It stores the integral part in the object
pointed to by <code class="varname">iptr</code>.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
        <code class="function">modf</code> behaves as though implemented by:
        </p>
        <div class="literallayout">
          <p><br />
          gentype <code class="function">modf</code> ( gentype <code class="varname">value</code>, gentype <code class="varname">*iptr</code> )<br />
          {<br />
                    <code class="varname">*iptr</code> = <a class="citerefentry" href="trunc.html"><span class="citerefentry"><span class="refentrytitle">trunc</span></span></a>( <code class="varname">value</code> );<br />
                    return <a class="citerefentry" href="copysign.html"><span class="citerefentry"><span class="refentrytitle">copysign</span></span></a>( <a class="citerefentry" href="isinf.html"><span class="citerefentry"><span class="refentrytitle">isinf</span></span></a>( <code class="varname">value</code> ) ? 0.0 : <code class="varname">value</code> -  <code class="varname">*iptr</code>, <code class="varname">value</code> );<br />
          }</p>
        </div>
        <p>
            The vector versions of the math functions operate component-wise. 
            The description is per-component.
        </p>
        <p>
            The built-in math functions are not affected by the prevailing rounding 
            mode in the calling environment, and always return the same value as they 
            would if called with the round to nearest even rounding mode.
        </p>
        <p>
            The built-in math functions take scalar or vector arguments. The generic type 
            name <span class="type">gentype</span> is used to indicate that the function can take 
            <span class="type">float</span>, <span class="type">float2</span>, <span class="type">float3</span>, <span class="type">float4</span>,
            <span class="type">float8</span>, or <span class="type">float16</span> as the type for the arguments. For 
            any specific use of these function, the actual type has to be the same for all 
            arguments and the return type.
        </p>
        <p>
            If extended with <a class="citerefentry" href="cl_khr_fp64.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp64</span></span></a>,
            generic type name <span class="type">gentype</span> may indicate <span class="type">double</span> and
            <span class="type">double{2|3|4|8|16}</span> as arguments and return values. If extended with
            <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>, generic type 
            name <span class="type">gentype</span> may indicate <span class="type">half</span> and <span class="type">half{2|3|4|8|16}</span> 
            as arguments and return values. 
        </p>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />
                                                 
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf#page=203" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math Functions</span></span></a> 
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2010 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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