hypot.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id='function.hypot' xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>hypot</refname>
  <refpurpose>
   计算直角三角形的斜边长度
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>float</type><methodname>hypot</methodname>
   <methodparam><type>float</type><parameter>x</parameter></methodparam>
   <methodparam><type>float</type><parameter>y</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>hypot</function> 函数将会根据直角三角形的两直角边长度
   <parameter>x</parameter> 和 <parameter>y</parameter> 计算其斜边的长度。或者是坐标点
   （<parameter>x</parameter>, <parameter>y</parameter>）到原点的距离。该函数的算法等同于
   <code>sqrt($x*$x + $y*$y)</code>。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>x</parameter></term>
     <listitem>
      <para>
       第一条边的长度
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>y</parameter></term>
     <listitem>
      <para>
       第二条边的长度
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   计算斜边的长度
  </para>
 </refsect1>
  </refentry>

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