import javax.swing.JOptionPane;


public class Week3 {

	public static void main(String[] args)
	{
		String input;
		input = JOptionPane.showInputDialog(null, "Bitte geben Sie einen Double Wert ein (3 Zeichen)");
		if (input.length() == 3);
		{
			if (input.charAt(0) >= 0 & input.charAt(0) <= 9 );
				{
					if (input.charAt(1) >= 0 & input.charAt(1) <= 9 );
					{
						if (input.charAt(2) >= 0 & input.charAt(2) <= 9 );
						{

						}
					}
				}

				else
				{
					System.out.println(input + " is not a valid (3 character) double literal");
				}
		}


	}

}