/* WinLoss.java -- ask the user for wins and losses, and calculate percent
 * of matches that were won.  Assume there are no ties.  Here we practice
 * two very important built-in classes for I/O:  StringTokenizer to help us
 * when reading input, and NumberFormat for printing output.
 */

import java.io.*;          // include I/O
import java.util.*;        // include string tokenizer class
import java.text.*;        // include number format class

public class WinLoss
{
  public static void main(String [] args) throws IOException
  {
    // ----------------------------------------------
    // input:  Ask the user for the win-loss record.
    // ----------------------------------------------
    BufferedReader kbd = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Please enter win-loss record (e.g. 15-7):  ");
    String input = kbd.readLine();

    // -----------------------------------------------------------------
    // We create a StringTokenizer object called "tok" that keeps track
    // of where we are in a String.  The string tokenizer needs to know 
    // what string to read from, and also what character(s) to ignore:  
    // In this case we want to ignore spaces and the hyphen.
    // -----------------------------------------------------------------
    StringTokenizer tok = new StringTokenizer(input, "- ");

    // ------------------------------------------------------
    // Use the nextToken() function to separate the numbers.
    // ------------------------------------------------------
    int wins = Integer.parseInt(tok.nextToken());
    int losses = Integer.parseInt(tok.nextToken());
  

    // -------------------------------------
    // the calculation is straightforward...
    // -------------------------------------
    double percent = 100.0 * wins / (wins + losses);


    // ---------------------------------------------------------------
    // Output the winning percentage -- to exactly 1 decimal place
    // We create a NumberFormat object called "formatter" that stores
    // information about how to format a number.  This is very similar
    // to the example on pp. 109-110 in the book.  Finally, we use
    // the format() function, which creates a String containing the
    // formatted number. 
    // ---------------------------------------------------------------
    NumberFormat formatter = NumberFormat.getNumberInstance();
    formatter.setMaximumFractionDigits(1);
    formatter.setMinimumFractionDigits(1);
    String expression = formatter.format(percent);

    System.out.println("Your winning percentage is " + expression + "%");
  }
}