import java.io.*;

public class Exercise19_10 {
  public static void main(String[] args) throws Exception {
    // Check usage
    if (args.length != 2) {
      System.out.println("Usage: java Exercise19_10 SourceFile numberOfPieces");
      System.exit(0);
    }

    BufferedInputStream input = new BufferedInputStream(new FileInputStream(
        new File(args[0])));

    int numberOfPieces = Integer.parseInt(args[1]);

    System.out.println("File size: " + input.available() + " bytes");
    long fileSize = input.available();
    int splitFileSize = (int)
      Math.ceil(1.0 * fileSize / numberOfPieces);
    
    for (int i = 1; i <= numberOfPieces; i++) {
      BufferedOutputStream output = new BufferedOutputStream(
          new FileOutputStream(new File(args[0] + "." + i)));
      int value;
      int count = 0;
      // What is wrong if these two conditions are placed in a different order?
      while (count++ < splitFileSize && (value = input.read()) != -1) {
        output.write(value);
      }
      output.close();
    }

    input.close();
  }
}