These operators are fairly self explanatory. The +, -, /,
and * operators respectively add, subtract, multiply, and divide two
stack values and push the result on the stack. The ++ and --
operators respectively add and subtract one to their operand. All these
operators can take a variable designator to replace one of their stack
operands. They can only be used with numeric operands, with the exception of
+ which can be used with any operand
(see section Reversed Equate String Operators). The +, ++, -, and
-- operators can also be applied to dates, where they add or
subtract days appropriately (or add or subtract two dates).
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