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Programming > Forth > Re: >FLOAT beha...
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Re: >FLOAT behavior with null string

by mhx@[EMAIL PROTECTED] (Marcel Hendrix) Mar 29, 2008 at 10:54 PM

Krishna Myneni <krishnamyneni@[EMAIL PROTECTED]
> writes Re: >FLOAT behavior
with null string

> The specification of >FLOAT in DPANS94 suggests that it treat a string
> of blanks as a representation of zero (below). Common practice among
> Forth systems (pfe, gforth, bigforth) appears to extend this suggested
> behavior to  null strings as well, e.g.

> s" " >FLOAT

> returns a true flag on the stack, and fp zero on the floating point
> stack. Is there a strong argument for considering a null string to be a
> valid representation of fp zero.

I guess that when reading a table, empty fields (all blanks) should parse
as zero.
This means that the last column(s) on a line is (are) a problem when 
someone has removed trailing spaces (humans would still know what is
being intended).

Or even easier (comma-delimited list):

1.13,3,,888,,,7e12

But I could be wrong.

-marcel




 8 Posts in Topic:
>FLOAT behavior with null string
Krishna Myneni <krishn  2008-03-29 13:01:12 
Re: >FLOAT behavior with null string
Bruce McFarling <agila  2008-03-29 11:19:12 
Re: >FLOAT behavior with null string
Elizabeth D Rather <er  2008-03-29 08:22:04 
Re: >FLOAT behavior with null string
Krishna Myneni <krishn  2008-03-29 17:03:18 
Re: >FLOAT behavior with null string
mhx@[EMAIL PROTECTED] (M  2008-03-29 22:54:13 
Re: >FLOAT behavior with null string
Bruce McFarling <agila  2008-03-29 16:45:12 
Re: >FLOAT behavior with null string
"Ed" <nospam  2008-03-30 13:14:19 
Re: >FLOAT behavior with null string
Bruce McFarling <agila  2008-03-29 21:53:24 

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tan12V112 Fri May 16 23:44:45 CDT 2008.