A Java program that writes Fibonacci numbers into an XML file

import java.math.*;
import java.io.*;


public class FibonacciXML {

  public static void main(String[] args) {
   
    try {
      FileOutputStream  fout = new FileOutputStream("fibonacci.xml");
      OutputStreamWriter out = new OutputStreamWriter(fout);      
      
      BigInteger low  = BigInteger.ZERO;
      BigInteger high = BigInteger.ONE;      
      
      out.write("<?xml version=\"1.0\"?>\r\n");  
      out.write("<Fibonacci_Numbers>\r\n");  
      for (int i = 0; i < 25; i++) {
        out.write("  <fibonacci index=\"" + i + "\">");
        out.write(low.toString());
        out.write("</fibonacci>\r\n");
        BigInteger temp = high;
        high = high.add(low);
        low = temp;
      }
      out.write("</Fibonacci_Numbers>");  
 
      out.close();
    }
    catch (IOException e) {
      System.err.println(e);
    }

  }

}