When you specify an expression, DCL evaluates values based on
the operations specified in the expression. The values can be
integers or character strings.
Some expression operators are conventional mathematical
symbols, for example, plus sign (+). Others specify logical
and comparison operations, and consist of letters preceded and
followed by periods; for example, .EQS. Operators are assigned a
precedence that determines their order of evaluation. You can use
parentheses to override this order.
For additional information on specifying expressions, refer to
the HP OpenVMS User's Manual.