I wonder if the tip might not benefit from more real world examples.
For example, presumably the normal usage would be to not throw away
the result, but rather:

  set x [200 + 42]

That said, I'd have to agree that math is at best the adopted ugly step-child 
of Tcl.  An alternative might be to just tie into [unknown].  eg:

#################################
    proc unknown {args} {
      if {[string match {[-0-9.]*} $args]} {
        return [expr $args]
      }
      error "unknown command: $args"
    }
 
    set x [200 + 42]
    set y [-0.1*2.3]
    puts "X,Y: $x,$y"

#################################

This gives more general support for floats and no spaces plus offers possible 
backward compatibility.  But of course, it still uses expr and ignores the 
C-syntax complaints of the tip...


On April 12, 2006 08:16 am, Kristoffer Lawson wrote:
...
>   /e.g./ to get 242 a simple addition can be made:
> 
>      200 + 42
> 
-- 
Peter MacDonald                 PDQ Interfaces Inc
Email: peter@[...].com      	http://pdqi.com
Phone: (250) 595-5998



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