public class prefixmain2 {

    public static void main(String args[])  {
        prefix2 parser;
        
        if (args.length < 1) {
            System.out.print("Usage: java prefixmain <filename>");
            return;
        } 
        try {  
            parser = new prefix2(new java.io.FileInputStream(args[0]));
        } catch (java.io.FileNotFoundException e) {
            System.out.println("File " + args[0] + " not found."); 
            return;
        } 
        try {
            parser.program();
            System.out.println("Parsing Successful");
        } catch (ParseException e) {
            System.out.println(e.getMessage());
            System.out.println("Parsing Failed");
        }
    }
}