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    <compoundname>avr_math</compoundname>
    <title>&lt;math.h&gt;: Mathematics</title>
      <sectiondef kind="define">
      <memberdef kind="define" id="group__avr__math_1ga9bf5d952c5c93c70f9e66c9794d406c9" prot="public" static="no">
        <name>M_E</name>
        <initializer>2.7182818284590452354</initializer>
        <briefdescription>
        </briefdescription>
        <detaileddescription>
<para>The constant <emphasis>e</emphasis>. </para>
        </detaileddescription>
        <inbodydescription>
        </inbodydescription>
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<para><programlisting><codeline><highlight class="normal">#include<sp/>&lt;math.h&gt;<sp/></highlight></codeline>
</programlisting></para>
<para>This header file declares basic mathematics constants and functions.</para>
<para><simplesect kind="par"><title>Notes:</title><para><itemizedlist>
<listitem><para>In order to access the functions declared herein, it is usually also required to additionally link against the library <computeroutput>libm.a</computeroutput>. See also the related <ref refid="FAQ_1faq_libm" kindref="member">FAQ entry</ref>.</para>
</listitem><listitem><para>Math functions do not raise exceptions and do not change the <computeroutput>errno</computeroutput> variable. Therefore the majority of them are declared with const attribute, for better optimization by GCC. </para>
</listitem></itemizedlist>
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