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

 Message        The expression "<expression>" has <type> type, which
                is not integral.

 Description    An expression that is required to have an integer
                type had a type that is not integral.  This is not
                valid.  An example of a situation where an integer is
                required is that in most modes Compaq C requires that
                the switch control expression have integer type.

 User Action    Modify or cast the expression so that it has integer
                type.