<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>

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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="frexp">
    <info>
        <copyright>
            <year>2011-2014</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>frexp</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>frexp</refname>
        <refpurpose>split a floating point number</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Declaration</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>genType <function>frexp</function></funcdef>
                <paramdef>genType <parameter>x</parameter></paramdef>
                <paramdef>out genIType <parameter>exp</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>x</parameter></term>
            <listitem>
                <para>
                    Specifies the value from which significand and exponent are to be extracted.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>out exp</parameter></term>
            <listitem>
                <para>
                    Specifies the variable into which to place the exponent
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>frexp</function> extracts <parameter>x</parameter> into a floating-point significand
            in the range [0.5, 1.0) and in integral exponent of two, such that:
        </para>
        <para>
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <mml:mi>x</mml:mi>
                <mml:mo>=</mml:mo>
                <mml:mi>significand</mml:mi>
                <mml:mo lspace="2px" rspace="2px">&sdot;</mml:mo>
                <mml:msup>
                <mml:mn>2</mml:mn>
                <mml:mi>exponent</mml:mi>
                </mml:msup>
            </mml:math></inlineequation>
        </para>
        <para>
            The significand is returned by the function and the exponent is returned in the output
            parameter <parameter>exp</parameter>. For a floating-point value of zero, the
            significand and exponent are both zero. For a floating-point value that is an
            infinity or a floating-point NaN, the results are undefined.
        </para>
    </refsect1>
    <refsect1 xml:id="versions">
        <title>Version Support</title>
        <informaltable>
            <tgroup cols="4" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="funchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry><function>frexp</function></entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='es31']/*)"/>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>ldexp</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 xml:id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"/> 2011-2014 Khronos Group. 
            This material may be distributed subject to the terms and conditions set forth in 
            the Open Publication License, v 1.0, 8 June 1999.
            <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
        </para>
    </refsect1>
</refentry>
