VMS Help RTL Routines, OTS$, OTS$POWCxJ, Returns  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    OpenVMS usage:complex_number
    type:         F_floating complex, D_floating complex, G_floating
                  complex
    access:       write only
    mechanism:    by value

    Complex result of raising a complex base to an integer exponent.
    OTS$POWCJ returns an F-floating complex number. OTS$POWCDJ_R3
    returns a D-floating complex number. OTS$POWCGJ_R3 returns a G-
    floating complex number. In each format, the result and base are
    of the same data type.