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Dos Batch Lang. Env Var Bug

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Name: Spytalk
Date: April 10, 2009 at 21:45:38 Pacific
OS: Windows 2000
CPU/Ram: n/a
Product: N/a / N/A
Subcategory: Software Problems
Comment:

I would like to see someone explain this IN DETAIL.

DOS command prompt in Windoze 2000:

set var2=

set /a var1=%var2%+1

(produces a 'missing operand' error)

BUT

set /a var1=+1

of course sets var1 equal to 1 with no error

In a windoze command prompt an environment variable that
doesn't exist is suppose to resolve to null in an expression.

Not sure if this is repeatable in XP
or true DOS. Please comment thanks.



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Response Number 1
Name: Mechanix2Go
Date: April 11, 2009 at 02:55:22 Pacific
Reply:

It's surely not repeatable in DOS because there is no set /a in DOS.


=====================================
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M2


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