/////////////////////////////////////////////////////////////////////////////
// ticks.cpp - measuring time on Win32 platforms
//
// Jim Fawcett, CSE691 - SW Modeling & Analysis, Fall 2000
/////////////////////////////////////////////////////////////////////////////
// Platform: Dell XPS1000, Windows 2000 Professional, SP1

#include <iostream>
#include <ctime>

using namespace std;

void main() {

  cout << "\n Measuring Time on Win32 Platforms "
       << "\n===================================\n";

  cout << "\n  unit of time is CLOCKS_PER_SEC = " 
       << CLOCKS_PER_SEC
       << " ticks per second";

  // clock function returns the time since the executing process
  // started multiplied by the constant CLOCKS_PER_SEC, e.g.,
  // with its current value of that constant, clock() returns
  // process running time in milliseconds.

  int count = 0;
  clock_t t,tprev, tstart;
  t = tstart = tprev = clock();
  while(true) {
    count++;
    tprev = t;
    t = clock();
    if(t>tprev)
      break;
  }
  double elapsedTime = double(t-tstart)/double(CLOCKS_PER_SEC);
  cout << "\n  time granularity is:  " 
       << elapsedTime
       << " seconds";
  cout << "\n  number of iterations: " << count;
  cout << "\n  iteration time = " << elapsedTime/count << " seconds";
  cout << "\n\n";
}