>C4_ONE</b> returns the value of 1 as a C4.
        </li>
        <li>
          <b>C4_PRINT</b> prints a C4.
        </li>
        <li>
          <b>C4_REAL</b> evaluates the real part of a C4.
        </li>
        <li>
          <b>C4_SIN</b> evaluates the sine of a C4.
        </li>
        <li>
          <b>C4_SINH</b> evaluates the hyperbolic sine of a C4.
        </li>
        <li>
          <b>C4_SQRT</b> returns the principal square root of a C4.
        </li>
        <li>
          <b>C4_SUB</b> s