/li>
        <li>
          <b>CH_IS_ALPHA</b> is TRUE if CH is an alphabetic character.
        </li>
        <li>
          <b>CH_IS_ALPHANUMERIC</b> is TRUE if CH is alphanumeric.
        </li>
        <li>
          <b>CH_IS_CONTROL</b> is TRUE if a character is a control character.
        </li>
        <li>
          <b>CH_IS_DIGIT</b> returns TRUE if a character is a decimal digit.
        </li>
        <li>
          <b>CH_IS_SPACE</b> is TRUE if a character is a whitespace character.
        </li>
