import java.io.*;
   import java.util.*;

/**
 * An example that illustrates the use of the
 * StringTokenizer class
 *
 * @author  Prof. David Bernstein, James Madison University
 * @version 1.0
 * @author Prof. Elizabeth Adams, James Madison University
 *
 */
    public class ExpressionTokenizer
   {
    /**
     * The entry point of the application
     *
     * @param args   The command-line arguments
     */
       public static void main(String[] args) throws IOException
      {
         double                 value;
         String                 myToken;
         StringTokenizer        myStringTokenizer;
      
      
      // Setup the delimiters
         if (args.length == 0) 
         {
            System.out.println("You didn't enter an expression!");
         } 
         else 
         {
            myStringTokenizer = new StringTokenizer(args[0], 
                       				    "+-x/%() \t\n",
                     				    true);   // Return delimiters
         
          // Tokenize the argument
            while (myStringTokenizer.hasMoreTokens()) 
            {
               myToken = myStringTokenizer.nextToken();
               System.out.print(myToken);
               System.out.flush();
            
            // Try to convert the token into a double
               try 
               {
                  value = Double.parseDouble(myToken);
                  System.out.print(" is a number");
                  System.out.flush();
               } 
                   catch (NumberFormatException nfe) 
                  {
                     System.out.print(" is not a number");
                     System.out.flush();
                  }
            
               System.out.println();
            } // end else
         } // end main
      } // end class
   
   
   
   
   }