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<?xml version='1.0'?>
<html xmlns='http://www.w3.org/1999/xhtml'
      xmlns:math='http://www.w3.org/1998/Math/MathML'
>
<head>
<title>Returns Elapsed Number of Seconds</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="Returns Elapsed Number of Seconds"/>
<meta name="keywords" id="keywords" content=" returns elapsed number of seconds elapsed_seconds time syntax purpose s microsoft systems example "/>
<style type='text/css'>
body { color : black }
body { background-color : white }
A:link { color : blue }
A:visited { color : purple }
A:active { color : purple }
</style>
<script type='text/javascript' language='JavaScript' src='_elapsed_seconds_xml.js'>
</script>
</head>
<body>
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<center><b><big><big>Returns Elapsed Number of Seconds</big></big></b></center>
<br/>
<b><big><a name="Syntax" id="Syntax">Syntax</a></big></b>

<br/>

<code><i><font color="black"><span style='white-space: nowrap'>s</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;elapsed_seconds()</span></font></code>


<br/>
<br/>
<b><big><a name="Purpose" id="Purpose">Purpose</a></big></b>
<br/>
This routine is accurate to within .02 seconds
(see <a href="elapsed_seconds.cpp.xml" target="_top"><span style='white-space: nowrap'>elapsed_seconds.cpp</span></a>
).
It does not necessary work for time intervals that are greater than a day.
<ol type="1"><li>
If running under the Microsoft compiler, it uses 
<code><font color="blue">::GetSystemTime</font></code> for timing.
</li><li>

Otherwise, if <code><font color="blue">gettimeofday</font></code> is available, it is used.
</li><li>

Otherwise, <code><font color="blue">std::clock()</font></code> is used.
</li></ol>


<br/>
<br/>
<b><big><a name="s" id="s">s</a></big></b>
<br/>
is a <code><font color="blue">double</font></code> equal to the 
number of seconds since the first call to <code><font color="blue">elapsed_seconds</font></code>.

<br/>
<br/>
<b><big><a name="Microsoft Systems" id="Microsoft Systems">Microsoft Systems</a></big></b>
<br/>
It you are using the Microsoft C++ compiler,
you will need to link in the external routine 
called <a href="microsoft_timer.xml" target="_top"><span style='white-space: nowrap'>microsoft_timer</span></a>
.


<br/>
<br/>
<b><big><a name="Example" id="Example">Example</a></big></b>
<br/>
The routine <a href="elapsed_seconds.cpp.xml" target="_top"><span style='white-space: nowrap'>elapsed_seconds.cpp</span></a>
 is
an example and test of this routine.



<hr/>Input File: cppad/elapsed_seconds.hpp

</body>
</html>