Assignemnt #76 Collatz Sequence

Code

    Name: Iaroslav Titov
    Period: 7
    Project Name: Collatz
    File Name: Collatz.java
    Date: 1/11/2015
    
import java.util.Scanner;
import java.util.InputMismatchException;

public class Collatz
{
	public static void main( String[] args ) throws Exception
	{
		Scanner keyboard = new Scanner(System.in);

		System.out.println("Enter a number to start the Collatz sequence with.\n");

		int counter = 0;
		int num = 0;
		try
		{
			System.out.print("Starting number: ");
			num = keyboard.nextInt();
		}
		catch (InputMismatchException e)
		{
			System.out.println("WRONG INPUT!!!");
		}

		while (num != 1)
		{
			System.out.print(num);
			for (int i = 0;i < 10 - Integer.toString(num).length();i++)
			System.out.print(" ");

			if (num % 2 == 0) num /= 2;
			else num = num*3+1;

			counter++;
			if (counter % 10 == 0) System.out.print("\n");
		}


		System.out.println(num);

		System.out.println("It took "+counter+" iterations to arrive to 1.");
	}
}

    

Picture of the output