[source lang = "cpp"]

//////
// my objects constructor
//////
if( !QueryPerformanceFrequency( &m_frequency ) )
 throw "QueryPerformanceFrequency failed";

//////
// my objects update-function
//////
LARGE_INTEGER start;
if( !QueryPerformanceCounter( &start ) )
 throw "QueryPerformanceCounter@start failed";

// do some computations, time-space-continuum disruptions and coffe...

LARGE_INTEGER end;
if( !QueryPerformanceCounter( &end ) )
 throw "QueryPerformanceCounter@end failed";

// calculate the time between start and end
double time = static_cast < double >( ( end.QuadPart - start.QuadPart ) / static_cast < double >( m_frequency.QuadPart ) );

// keep track of time
static double counter = 0;
counter += time;

// average computations per second
double computations = 1.0 / time;

// run the app for approximately 1 second
if( counter >= 1.0 )
 return computations;

[source lang = "cpp"]#include <windows.h>#include <iostream>int main( int argc, char** argv ){	LARGE_INTEGER frequency;	QueryPerformanceFrequency( &frequency );	double _frequency = static_cast < double >( frequency.QuadPart );		double counter = 0;	while( counter < 10 )	{		LARGE_INTEGER start = { 0 };		QueryPerformanceCounter( &start );		double _start = static_cast < double >( start.QuadPart );		// seems correct	//	Sleep( 10 );		// seems incorrect	//	Sleep( 1 );		// the more work we throw to our cpu, the more it seems to differ	//	for( int i = 0; i < 100000; ++i )	//		float a = i * 3.1415192f;				LARGE_INTEGER end = { 0 };		QueryPerformanceCounter( &end );		double _end = static_cast < double >( end.QuadPart ); 		double time = ( _end - _start ) / _frequency;		counter += time; 		std::cout << counter;		// my knowledge in console programming is.. limitied ;P		for( int i = 0; i < 1000; ++i )			std::cout << "\b";	}}