public class Numbers
{
   /**
      Returns the number of digits in the binary
      representation of a number
      @param n a nonnegative number
      @return the number of binary digits needed to
      represent n
   */

   // TODO: supply the method
   public static int binaryDigits(int num)
   {
      return Integer.toBinaryString(num).length();
   }

   public static void main(String[] args)
   {
      System.out.println(Numbers.binaryDigits(1000));
   }
}