import java.text.NumberFormat;
import java.util.Scanner;

public class WinPercentage {
   public static void main (String[] args)  {
      final int NUM_GAMES = 12;
      int won;
      double ratio;

      Scanner scan = new Scanner (System.in);

      System.out.print ("Enter the number of games won (0 to "
                        + NUM_GAMES + "): ");
      won = scan.nextInt();
     while (won < 0 || won > NUM_GAMES)      {
         System.out.print ("Invalid input. Please reenter: ");
         won = scan.nextInt();
      }

      ratio = (double)won / NUM_GAMES;

      NumberFormat fmt = NumberFormat.getPercentInstance();

      System.out.println ();
      System.out.println ("Winning percentage: " + fmt.format(ratio));
   }
}
