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

  Arithmetic expressions contain numeric data such as variables,
  record elements, array elements, constants, function references,
  and arithmetic expressions enclosed in parentheses.  The expression
  evaluates to a numeric value.  The numeric operators are as
  follows:

       OPERATOR    RANK        DESCRIPTION
          **        1          exponentiation (evaluated
                                   right to left)
          *         2          multiplication
          /         2          division
          +         3          addition
          -         3          subtraction

  You can use parentheses to force an order of evaluation.