VMS Help CC, Messages, EXPRCVTINT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        The expression "<expression>" has been converted to
                integer.

 Description    In certain modes, Compaq C will allow switch
                expressions or case constants to be non-integer
                types.  The expression or constant will be converted
                to int.  In one of these cases, this warning will be
                issued.

 User Action    Cast the switch expression to an integer type or use
                an integer case constant.