sanna3n

Main.java

/**
 * Main class
 * @author Susanna Kempe
 * @version 10th October 2011
 */
public class Main {

	/**
	 * @param args the command line arguments
	 */
	public static void main(String[] args) {
		int lower;
		int upper;
		int max = 0;
		int count;
		long numberCopy;

		lower = Integer.parseInt(args[0]);
		upper = Integer.parseInt(args[1]);

		for (long i= upper; i >= lower; i--) {
			count = 2;
			numberCopy = i;
			while (numberCopy != 2) {
				count++;
				numberCopy = (((numberCopy&1)) == 0) ? numberCopy>>1 : (3*numberCopy) +1;
				
				if ((numberCopy&1) == 0) {
					numberCopy = numberCopy >> 1;
				}
				else {
					numberCopy = (3* numberCopy) +1;
				}
			}
			if (count > max) {
				max = count;
			}
			
		}
		System.out.println(lower + " " + upper + " " + max);
	}

}