/*
 *  Copyright (C) 2009  E.Albert, P.Arenas, S.Genaim, G.Puebla, and D.Zanardini
 *                      https://costa.ls.fi.upm.es
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package pubs;
/**
 * A simple class with a method with a simple for loop which calls
 * another method with logarithmic complexity, thus resulting in 
 * O(n * log n) complexity.
 * 
 * 
 * @author E.Albert, P.Arenas, S.Genaim, and G.Puebla
 * 
 */
class EvenDigits{

	static int divByTwo(int n){
		int acu=0;
		while (n>0){
			n=n/2;
			acu++;
		}
		return acu;
	}

	/**
	 * Method with O(n * log n) complexity.
	 * 
	 */
	static int evenDigits(int n){
		int acu=0;
		for (int i=0; i<n; i++){
			acu=acu+divByTwo(i);
		}

		return acu;
	}

	public static void main(String[] args) {

		int test;
		int result;
 		
		// First test
		test = 10;
		result = evenDigits(test);
		System.out.println("Result: "+result);
		/*
		// Second test
		test = 50;
		result = evenDigits(test);
		System.out.println("Result: "+result);

		// Third test
		test = 100;
		result = evenDigits(test);
		System.out.println("Result: "+result);
		*/
	}
};