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Negative number?

 
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dmonckton
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Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
PostPosted: Tue Jul 08, 2008 2:56 pm    Post subject: Negative number? Reply with quote
Hi

Is this function the best way (resource efficient) to test for a negative number?
Code:
:negative
    if @greater(%1,0)
        exit
    elsif @zero(%1)
        exit
    else
        exit 1
    end
    exit


Thanks

David...
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attreus
Valued Newbie


Joined: 30 Jul 2002
Posts: 46
Location: Berlin/Germany
PostPosted: Tue Jul 08, 2008 4:14 pm    Post subject: Reply with quote
how about with this:


Code:



:negative
    if @numeric(@substr(%1,1))
        exit
    else
        exit 1
    end


or better


:negative
    if @less(%1,0)
        exit 1
    else
        exit
    end





edit:

here is one for the lazy


Code:



:negative
   exit @less(%1,0)





another way would be


Code:



while @less(0,%1)

  ... do useful things such as
  wait

wend




Last edited by attreus on Wed Jul 09, 2008 2:05 am; edited 1 time in total
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
PostPosted: Tue Jul 08, 2008 5:50 pm    Post subject: Reply with quote
IMHO you should do the following...

Code:

:negative
  %R =
  %A = @pos(-,%1)
  if @Greater(%A,0)
   %R = 1
  End
Exit %R


Thanks,
Dragonsphere
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
PostPosted: Tue Jul 08, 2008 5:53 pm    Post subject: Reply with quote
IMHO I don't think it a good idea to break out of a IF with the Exit command.

Thanks,
Dragonsphere
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uvedese
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Joined: 21 Jan 2006
Posts: 169
Location: Spain
PostPosted: Tue Jul 08, 2008 8:29 pm    Post subject: Reply with quote
What about this? Wink

Code:
:Negative
  if @equal(@substr(%1,1),"-")
    exit 1
  else
    exit
  end


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uVeDeSe
http://www.uvedese.es
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dmonckton
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Joined: 09 Aug 2002
Posts: 117
Location: Lewes, U.K.
PostPosted: Tue Jul 22, 2008 11:34 am    Post subject: Reply with quote
Thanks for all the ideas. I assume @less() is a VDS6 function? I have not moved on to VDS6 yet and not to sure I will!

Thanks again

David.M
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