<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.15"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>libstdc++: std::exponential_distribution< _RealType > Class Template Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtreedata.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> /* @license 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align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a06408.html">param_type</a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a> Public Types</h2></td></tr> <tr class="memitem:ac591303d7888e5576784bf67be998683"><td class="memItemLeft" align="right" valign="top">typedef _RealType </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a></td></tr> <tr class="separator:ac591303d7888e5576784bf67be998683"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a> Public Member Functions</h2></td></tr> <tr class="memitem:a2a29bf56b7218591ea6313052a17150d"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a2a29bf56b7218591ea6313052a17150d">exponential_distribution</a> (const <a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> &__lambda=<a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a>(1))</td></tr> <tr class="separator:a2a29bf56b7218591ea6313052a17150d"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a1f276950e5f5d905f06767c6b0efb214"><td class="memItemLeft" align="right" valign="top"><a id="a1f276950e5f5d905f06767c6b0efb214"></a>  </td><td class="memItemRight" valign="bottom"><b>exponential_distribution</b> (const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr> <tr class="separator:a1f276950e5f5d905f06767c6b0efb214"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a19f4762d8185bb2a65280692ec976ad8"><td class="memTemplParams" colspan="2"><a id="a19f4762d8185bb2a65280692ec976ad8"></a> template<typename _ForwardIterator , typename _UniformRandomNumberGenerator > </td></tr> <tr class="memitem:a19f4762d8185bb2a65280692ec976ad8"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>__generate</b> (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng)</td></tr> <tr class="separator:a19f4762d8185bb2a65280692ec976ad8"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a523c37673ded09fe1c5bbd12030dd2d5"><td class="memTemplParams" colspan="2"><a id="a523c37673ded09fe1c5bbd12030dd2d5"></a> template<typename _ForwardIterator , typename _UniformRandomNumberGenerator > </td></tr> <tr class="memitem:a523c37673ded09fe1c5bbd12030dd2d5"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>__generate</b> (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng, const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr> <tr class="separator:a523c37673ded09fe1c5bbd12030dd2d5"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:addfb3422ce175b9fdfc0f3f7d9163b94"><td class="memTemplParams" colspan="2"><a id="addfb3422ce175b9fdfc0f3f7d9163b94"></a> template<typename _UniformRandomNumberGenerator > </td></tr> <tr class="memitem:addfb3422ce175b9fdfc0f3f7d9163b94"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>__generate</b> (<a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> *__f, <a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> *__t, _UniformRandomNumberGenerator &__urng, const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr> <tr class="separator:addfb3422ce175b9fdfc0f3f7d9163b94"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a03a1280a3dec72c2ca4045eaa026887b"><td class="memItemLeft" align="right" valign="top">_RealType </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a03a1280a3dec72c2ca4045eaa026887b">lambda</a> () const</td></tr> <tr class="separator:a03a1280a3dec72c2ca4045eaa026887b"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ac4d57abc4ee818a817139259105ef090"><td class="memItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#ac4d57abc4ee818a817139259105ef090">max</a> () const</td></tr> <tr class="separator:ac4d57abc4ee818a817139259105ef090"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a21226cd61a367799a695c438f6c0af26"><td class="memItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a21226cd61a367799a695c438f6c0af26">min</a> () const</td></tr> <tr class="separator:a21226cd61a367799a695c438f6c0af26"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a11a94d907e89a229cfd4083cb8e6a14c"><td class="memTemplParams" colspan="2">template<typename _UniformRandomNumberGenerator > </td></tr> <tr class="memitem:a11a94d907e89a229cfd4083cb8e6a14c"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06404.html#a11a94d907e89a229cfd4083cb8e6a14c">operator()</a> (_UniformRandomNumberGenerator &__urng)</td></tr> <tr class="separator:a11a94d907e89a229cfd4083cb8e6a14c"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a6e7aba83ef881852232232c5242231ff"><td class="memTemplParams" colspan="2"><a id="a6e7aba83ef881852232232c5242231ff"></a> template<typename _UniformRandomNumberGenerator > </td></tr> <tr class="memitem:a6e7aba83ef881852232232c5242231ff"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memTemplItemRight" valign="bottom"><b>operator()</b> (_UniformRandomNumberGenerator &__urng, const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr> <tr class="separator:a6e7aba83ef881852232232c5242231ff"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a79a2944c707f21d96fb329d89c001cb0"><td class="memItemLeft" align="right" valign="top"><a class="el" href="a06408.html">param_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a79a2944c707f21d96fb329d89c001cb0">param</a> () const</td></tr> <tr class="separator:a79a2944c707f21d96fb329d89c001cb0"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ac53c5c21d59b131a95ca5d5d8fdfe37a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#ac53c5c21d59b131a95ca5d5d8fdfe37a">param</a> (const <a class="el" href="a06408.html">param_type</a> &__param)</td></tr> <tr class="separator:ac53c5c21d59b131a95ca5d5d8fdfe37a"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a1d72f5ccd6ee769af3d8cc82ed350e99"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a1d72f5ccd6ee769af3d8cc82ed350e99">reset</a> ()</td></tr> <tr class="separator:a1d72f5ccd6ee769af3d8cc82ed350e99"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="friends"></a> Friends</h2></td></tr> <tr class="memitem:acb5724229a97210048c27dba8f3a50b4"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#acb5724229a97210048c27dba8f3a50b4">operator==</a> (const <a class="el" href="a06404.html">exponential_distribution</a> &__d1, const <a class="el" href="a06404.html">exponential_distribution</a> &__d2)</td></tr> <tr class="separator:acb5724229a97210048c27dba8f3a50b4"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <div class="textblock"><h3>template<typename _RealType = double><br /> class std::exponential_distribution< _RealType ></h3> <p>An exponential continuous distribution for random numbers. </p> <p>The formula for the exponential probability density function is <img class="formulaInl" alt="$p(x|\lambda) = \lambda e^{-\lambda x}$" src="form_20.png"/>.</p> <a class="anchor" id=""></a> <table border="1" cellpadding="10" cellspacing="0"> <caption align="top">Distribution Statistics</caption> <tr> <td>Mean</td><td><img class="formulaInl" alt="$\frac{1}{\lambda}$" src="form_21.png"/> </td></tr> <tr> <td>Median</td><td><img class="formulaInl" alt="$\frac{\ln 2}{\lambda}$" src="form_22.png"/> </td></tr> <tr> <td>Mode</td><td><img class="formulaInl" alt="$zero$" src="form_23.png"/> </td></tr> <tr> <td>Range</td><td><img class="formulaInl" alt="$[0, \infty]$" src="form_24.png"/> </td></tr> <tr> <td>Standard Deviation</td><td><img class="formulaInl" alt="$\frac{1}{\lambda}$" src="form_21.png"/> </td></tr> </table> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04551">4551</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div><h2 class="groupheader">Member Typedef Documentation</h2> <a id="ac591303d7888e5576784bf67be998683"></a> <h2 class="memtitle"><span class="permalink"><a href="#ac591303d7888e5576784bf67be998683">◆ </a></span>result_type</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="memname"> <tr> <td class="memname">typedef _RealType <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::<a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a></td> </tr> </table> </div><div class="memdoc"> <p>The type of the range of the distribution. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04554">4554</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <h2 class="groupheader">Constructor & Destructor Documentation</h2> <a id="a2a29bf56b7218591ea6313052a17150d"></a> <h2 class="memtitle"><span class="permalink"><a href="#a2a29bf56b7218591ea6313052a17150d">◆ </a></span>exponential_distribution()</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname"><a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::<a class="el" href="a06404.html">exponential_distribution</a> </td> <td>(</td> <td class="paramtype">const <a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> & </td> <td class="paramname"><em>__lambda</em> = <code><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a>(1)</code></td><td>)</td> <td></td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">explicit</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Constructs an exponential distribution with inverse scale parameter <img class="formulaInl" alt="$\lambda$" src="form_37.png"/>. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04594">4594</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <h2 class="groupheader">Member Function Documentation</h2> <a id="a03a1280a3dec72c2ca4045eaa026887b"></a> <h2 class="memtitle"><span class="permalink"><a href="#a03a1280a3dec72c2ca4045eaa026887b">◆ </a></span>lambda()</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname">_RealType <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::lambda </td> <td>(</td> <td class="paramname"></td><td>)</td> <td> const</td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Returns the inverse scale parameter of the distribution. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04615">4615</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> <p class="reference">Referenced by <a class="el" href="a17055_source.html#l01734">std::operator<<()</a>.</p> </div> </div> <a id="ac4d57abc4ee818a817139259105ef090"></a> <h2 class="memtitle"><span class="permalink"><a href="#ac4d57abc4ee818a817139259105ef090">◆ </a></span>max()</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::max </td> <td>(</td> <td class="paramname"></td><td>)</td> <td> const</td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Returns the least upper bound value of the distribution. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04644">4644</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> <p class="reference">References <a class="el" href="a00095_source.html#l00321">std::numeric_limits< _Tp >::max()</a>.</p> </div> </div> <a id="a21226cd61a367799a695c438f6c0af26"></a> <h2 class="memtitle"><span class="permalink"><a href="#a21226cd61a367799a695c438f6c0af26">◆ </a></span>min()</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::min </td> <td>(</td> <td class="paramname"></td><td>)</td> <td> const</td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Returns the greatest lower bound value of the distribution. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04637">4637</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <a id="a11a94d907e89a229cfd4083cb8e6a14c"></a> <h2 class="memtitle"><span class="permalink"><a href="#a11a94d907e89a229cfd4083cb8e6a14c">◆ </a></span>operator()()</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <div class="memtemplate"> template<typename _UniformRandomNumberGenerator > </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::operator() </td> <td>(</td> <td class="paramtype">_UniformRandomNumberGenerator & </td> <td class="paramname"><em>__urng</em></td><td>)</td> <td></td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Generating functions. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04652">4652</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <a id="a79a2944c707f21d96fb329d89c001cb0"></a> <h2 class="memtitle"><span class="permalink"><a href="#a79a2944c707f21d96fb329d89c001cb0">◆ </a></span>param() <span class="overload">[1/2]</span></h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname"><a class="el" href="a06408.html">param_type</a> <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::param </td> <td>(</td> <td class="paramname"></td><td>)</td> <td> const</td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Returns the parameter set of the distribution. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04622">4622</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> <p class="reference">Referenced by <a class="el" href="a17055_source.html#l01757">std::operator>>()</a>.</p> </div> </div> <a id="ac53c5c21d59b131a95ca5d5d8fdfe37a"></a> <h2 class="memtitle"><span class="permalink"><a href="#ac53c5c21d59b131a95ca5d5d8fdfe37a">◆ </a></span>param() <span class="overload">[2/2]</span></h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname">void <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::param </td> <td>(</td> <td class="paramtype">const <a class="el" href="a06408.html">param_type</a> & </td> <td class="paramname"><em>__param</em></td><td>)</td> <td></td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Sets the parameter set of the distribution. </p> <dl class="params"><dt>Parameters</dt><dd> <table class="params"> <tr><td class="paramname">__param</td><td>The new parameter set of the distribution. </td></tr> </table> </dd> </dl> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04630">4630</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <a id="a1d72f5ccd6ee769af3d8cc82ed350e99"></a> <h2 class="memtitle"><span class="permalink"><a href="#a1d72f5ccd6ee769af3d8cc82ed350e99">◆ </a></span>reset()</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname">void <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::reset </td> <td>(</td> <td class="paramname"></td><td>)</td> <td></td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">inline</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Resets the distribution state. </p> <p>Has no effect on exponential distributions. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04609">4609</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <h2 class="groupheader">Friends And Related Function Documentation</h2> <a id="acb5724229a97210048c27dba8f3a50b4"></a> <h2 class="memtitle"><span class="permalink"><a href="#acb5724229a97210048c27dba8f3a50b4">◆ </a></span>operator==</h2> <div class="memitem"> <div class="memproto"> <div class="memtemplate"> template<typename _RealType = double> </div> <table class="mlabels"> <tr> <td class="mlabels-left"> <table class="memname"> <tr> <td class="memname">bool operator== </td> <td>(</td> <td class="paramtype">const <a class="el" href="a06404.html">exponential_distribution</a>< _RealType > & </td> <td class="paramname"><em>__d1</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">const <a class="el" href="a06404.html">exponential_distribution</a>< _RealType > & </td> <td class="paramname"><em>__d2</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </td> <td class="mlabels-right"> <span class="mlabels"><span class="mlabel">friend</span></span> </td> </tr> </table> </div><div class="memdoc"> <p>Return true if two exponential distributions have the same parameters. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l04692">4692</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <hr/>The documentation for this class was generated from the following files:<ul> <li><a class="el" href="a00452_source.html">random.h</a></li> <li><a class="el" href="a17055_source.html">bits/random.tcc</a></li> </ul> </div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="navelem"><a class="el" href="a01538.html">std</a></li><li class="navelem"><a class="el" href="a06404.html">exponential_distribution</a></li> <li class="footer">Generated by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.15 </li> </ul> </div> </body> </html>