From: Robert C. Duvall <rcd@cs.duke.edu>
  To  : 
  Date: 01 Feb 1999 23:45:14 -0500

Re: Unary Negation Operator

> I'm having trouble trying to understand the point of the "-" operator.
> How do we differentiate between making a number negative and subtracting
> from the previous answer?
> 
> For example, what should happen in this test run:
> 
> > b = 6
> 6
> > 3 + 4
> 7
> > - b
> 
> Should this subtract 6 from 7 or should this make b equal to -6?

As posted previously, this is an ambiguity in the specification and
you should handle it any way you feel is appropriate so long as you
DOCUMENT your choice clearly.

rcd


-- 
Robert C. Duvall
Lecturer, Duke University
rcd@cs.duke.edu