/** adapted from JavaTutorial: example of simple file I/O using
 ** classes derived from Reader and Writer. 
 **/

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class CopyChars {

  public static void main(String[] args) {
    if (args.length != 1) 
      System.out.println("usage: CopyChars file_to_copy");
    else {
      CopyChars obj = new CopyChars();
      try {
        obj.makeCopy(args[0]);
      }
      catch (IOException e) {
        System.out.println(e);
      }
    }
  }

  public void makeCopy(String filename) throws IOException {
    FileReader in = new FileReader(filename);
    FileWriter out = new FileWriter(filename + ".copy");
    
    int c;
      
    // Read characters from the reader until in.read returns -1
    while (true) {
      c = in.read();
      if (c == -1)
        break;
      out.write(c);
    }

    in.close();
    out.close();
  }
}