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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 syntax purpose s source code "/>
<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_c_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
It does not necessary work for time intervals that are greater than a day.

<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="Source Code" id="Source Code">Source Code</a></big></b>

<code><font color='blue'><pre style='display:inline'> 
# if _MSC_VER
// ---------------------------------------------------------------------------
// Microsoft version of timer
# include &lt;windows.h&gt;
# include &lt;cassert&gt;
double elapsed_seconds(void)
{	static bool       first_  = true;
	static SYSTEMTIME st_;
	double hour, minute, second, milli, diff;
	SYSTEMTIME st;

	if( first_ )
	{	GetSystemTime(&amp;st_);
		first_ = false;
		return 0.;
	}
	GetSystemTime(&amp;st);

	hour   = (double) st.wHour         - (double) st_.wHour;
	minute = (double) st.wMinute       - (double) st_.wMinute;
	second = (double) st.wSecond       - (double) st_.wSecond;
	milli  = (double) st.wMilliseconds - (double) st_.wMilliseconds;

	diff   = 1e-3*milli + second + 60.*minute + 3600.*hour;
	if( diff &lt; 0. )
		diff += 3600.*24.;
	assert( 0 &lt;= diff &amp;&amp; diff &lt; 3600.*24. );

	return diff;
}
# else
// ---------------------------------------------------------------------------
// Unix version of timer
# include &lt;sys/time.h&gt;
double elapsed_seconds(void)
{	double sec, usec, diff;

	static bool first_ = true;
	static struct timeval tv_first;		
	struct timeval        tv;
	if( first_ )
	{	gettimeofday(&amp;tv_first, NULL);
		first_ = false;
		return 0.;
	}
	gettimeofday(&amp;tv, NULL);
	assert( tv.tv_sec &gt;= tv_first.tv_sec );

	sec  = (double)(tv.tv_sec -  tv_first.tv_sec);
	usec = (double)tv.tv_usec - (double)tv_first.tv_usec;
	diff = sec + 1e-6*usec;

	return diff;
}
# endif
</pre></font></code>


<hr/>Input File: compare_c/det_by_minor.c

</body>
</html>