public class Main {
  public static void main(String argv[])
    {
      try {
        /* allocate a parser object */
        parser parse_obj = new parser();

        /* prompt the user */
        System.out.println("Reading expressions from standard input...");

        /* deterimine if we doing debug or normal parse, and do it */
        if (argv.length >= 1 && argv[0].equals("-debug"))
	  {
	      parse_obj.debug_parse();
	  }
        else
	  {
	    parse_obj.parse();
	  }
      } catch (java.lang.Exception ex) {
	 System.err.println("Exception: " + ex.getMessage());
         ex.printStackTrace();
	 System.exit(-1);
      }
    }
};