#include <Windows.h> 
#include <stdio.h>

double getCPUTime(void) 
{ /* Windows */ 
FILETIME createTime, exitTime, kernelTime, userTime; 
  if(GetProcessTimes(GetCurrentProcess(), 
       &createTime, &exitTime, &kernelTime,
       &userTime) != -1 ) 
  { 
    SYSTEMTIME userSystemTime;
    if(FileTimeToSystemTime(&userTime,
          &userSystemTime)!= -1 ) 
    return (double)userSystemTime.wHour * 3600.0 + 
           (double)userSystemTime.wMinute * 60.0 + 
           (double)userSystemTime.wSecond + 
           (double)userSystemTime.wMilliseconds 
               / 1000.0; 
  } 
  return -1; /* Failed. */ 
}    
int main(int argc, char **argv) 
{ 
  double startTime, endTime; 
  startTime = getCPUTime( ); 
  for(int i=0;i<600000000;i++) 
  {} 
  endTime = getCPUTime( ); 
  printf( "CPU time used = %lf\n",  
           (endTime-startTime) ); 
  return 0; 
}