///////   Lowercase.java   /////// 
// Example for text-file I/O

import java.io.*;

class Lowercase
{   public static void doio(InputStream i, OutputStream o)
    {   int c;
        InputStreamReader in = new InputStreamReader(i);
        OutputStreamWriter out = new OutputStreamWriter(o);
        try
        {  while ( (c = in.read()) >= 0 )
           {  c = Character.toLowerCase( (char) c);
              out.write(c);
            }
            out.flush();
        } catch( IOException e )
          {  System.err.println("doio: I/O Problem");
             System.err.println(e.getMessage());
             System.exit(1);
          }
    }

    public static void main (String args[])
    {   int argn = args.length;
        if ( argn == 0 )      // use standard I/O
            doio(System.in, System.out);
        else if ( argn == 2 ) // use files given
        { try 
          {  FileInputStream infile = 
                   new FileInputStream(args[0]);
             FileOutputStream ofile =
                   new FileOutputStream(args[1]);
             doio(infile, ofile);
             infile.close(); ofile.close();
          } catch ( FileNotFoundException e )
            {  System.err.println(
                  "Can't open input file " + args[0]);
               System.err.println(e.getMessage());
               System.exit(1);
            }
            catch ( IOException e )
            {  System.err.println(
                  "Can't open output file " + args[1]);
               System.err.println(e.getMessage());
               System.exit(1);
            }
        }
        else   // error
        { System.err.println("Usage: Lowercase infile outfile");
          System.exit(1);
        }
    }
}