the ability to request a full, modified,
      or "cheap" Newton iteration.
      <ul>
        <li>
          <a href = "pitcon66_prb5.f">pitcon66_prb5.f</a>,
          a sample calling program.
        </li>
        <li>
          <a href = "pitcon66_prb5.sh">pitcon66_prb5.sh</a>,
          commands to compile and run the sample program.
        </li>
        <li>
          <a href = "pitcon66_prb5_output.txt">pitcon66_prb5_output.txt</a>,
          the output file.
        </li>
      </ul>
    </p>

    