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MathGroup Archive 2005

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Re: Leading Zeros? (question rephrased)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54599] Re: Leading Zeros? (question rephrased)
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Thu, 24 Feb 2005 03:21:03 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <cv6sms$6p2$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <cv6sms$6p2$1 at smc.vnet.net>, AES <siegman at stanford.edu> 
wrote:

> Instead I'm asking, suppose I type
> 
>    y = {001,002,003}; 
> 
> into a newly opened "virgin" instance of Mathematica, without defining 
> any special formats or rules before I do this.  
> 
> Are the leading zeros that I type into this list captured and stored 
> somehow by Mathematica?  
> 
> Or is the default response that they're ignored and lost forever?  (As I 
> believe they are.) 

They are lost but they are not ignored -- they are definitely parsed. 
You can use $PreRead to see this:

  $PreRead = (Print[FullForm[#]]; #) &;

  {001,002,003}

(Note that the output you get depends upon whether the Input cell 
containing {001,002,003} is StandardForm, InputForm, or TraditionalForm).

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 6488 2734
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