/sys$common/syshlp/helplib.hlb CC, Messages, UNSUPCONV  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        Hexadecimal floating point constants are not yet
                implemented.

 Description    Hexadecimal floating point constants are a new C99
                feature that is not yet supported on this platform.

 User Action    Please use traditional syntax for floating point
                numbers.