using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;


namespace ForEach_Example
{
    public class Timer
    {
        [DllImport("KERNEL32"), System.Security.SuppressUnmanagedCodeSecurityAttribute()]
        private static extern int QueryPerformanceCounter(out long time);

        [DllImport("KERNEL32"), System.Security.SuppressUnmanagedCodeSecurityAttribute()]
        private static extern int QueryPerformanceFrequency(out long freq);

        private long _freq;
        private long _start;
        private long _stop;

        public Timer()
        {
            QueryPerformanceFrequency(out _freq);
        }

        public Timer(int maxSamples)
        {
            QueryPerformanceFrequency(out _freq);
        }

        public void Start()
        {
            QueryPerformanceCounter(out _start);
        }

        public void Stop()
        {
            QueryPerformanceCounter(out _stop);
        }


        public double Seconds
        {
            get
            {
                return ((double)(_stop - _start)) / (double)_freq;
            }
        }

        public double Milliseconds
        {
            get
            {
                return Seconds * 1000;
            }
        }

        public long Ticks
        {
            get
            {
                return _stop - _start;
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            bool b;
            Timer _timer = new Timer();

            BitArray newBitArray = new BitArray(1000, false);

            int variation = (args.Length > 0) ? Int32.Parse(args[0]) : 2;

            switch (variation)
            {
                case 1:
                    _timer.Start();
                    for (int j = 0; j < 1000; j++)
                    {
                        for (int i = 0; i < newBitArray.Count; i++)
                        {
                            b = newBitArray[i];
                        }
                    }
                    _timer.Stop();
                    Console.WriteLine("Total Time for Indexed based access = {0}", _timer.Seconds);
                    break;

                case 2:
                    _timer.Start();
                    for (int j = 0; j < 1000; j++)
                    {
                        foreach (bool b2 in newBitArray)
                        {
                            b = b2;
                        }
                    }
                    _timer.Stop();
                    Console.WriteLine("Total Time for enumerator = {0}", _timer.Seconds);
                    break;
            }
        }
    }
}