package UEB01;

public class Zeitmessung
{
	static int tuWasCounter = 0;
	private static double tuwas()
	{
		tuWasCounter++;
		return Math.random();
	}

	// Linear
	public static double func1(int n)
	{
		double summe = 0;

		for (int a = 0; a < n; a++)
			summe += tuwas();

		return summe;
	}

	// Quadratisch
	public static double func2(int n)
	{
		double summe = 0;

		for (int a = 0; a < n; a++)
			for(int b = 0; b < n; b++)
				summe += tuwas();

		return summe;
	}

	// log2(n)
	public static double func6(int n)
	{
		double summe = 0;

		while (n > 0)
		{
			summe += tuwas();
			n /= 2;
		}

		return summe;
	}

	public static void main(String[] args)
	{
		StopUhr uhr = new StopUhr();
		final int n = 100000;
		tuWasCounter = 0;
		uhr.start();
		func1(n);
		uhr.stop();
		System.out.println("func1 "+"n="+n+" Zeit:"+uhr.getDuration()+" tuWasCounter:" + tuWasCounter);
		tuWasCounter = 0;
		uhr.start();
		func2(n);
		uhr.stop();
		System.out.println("func2 "+"n="+n+" Zeit:"+uhr.getDuration()+" tuWasCounter:" + tuWasCounter);
		tuWasCounter = 0;
		uhr.start();
		func6(n);
		uhr.stop();
		System.out.println("func6 "+"n="+n+" Zeit:"+uhr.getDuration()+" tuWasCounter:" + tuWasCounter);
	}
}