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

    Complex result of complex division. OTS$DIVC returns an F-
    floating complex number. OTS$DIVCD_R3 returns a D-floating
    complex number. OTS$DIVCG_R3 returns a G-floating complex number.
    OST$DIVCS returns an IEEE S-floating complex number. OTS$DIVCT_R3
    returns an IEEE T-floating complex number.