/sys$common/syshlp/helplib.hlb FORTRAN, Data, Expressions, Logical  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Logical expressions can contain logical and integer data such as
  variables, record elements, array elements, constants, function
  references, expressions enclosed in parentheses, and relational
  expressions.  The expression evaluates to a logical value using the
  following operators:

       OPERATOR       PRECEDENCE
        **             First (Highest)
        *,/            Second
        +,-,//         Third
        Relational
         Operators     Fourth
        .NOT.          Fifth
        .AND.          Sixth
        .OR.           Seventh
        .XOR.          Eighth (Lowest)
        .NEQV.         Eighth
        .EQV.          Eighth