Math expressions with 08 or 09 -> zsh2.6-beta10

Math expressions with 08 or 09 -> zsh2.6-beta10

[Paul H. Becker]

These leading zeros are inconsistent.  Math expressions do not seem to
like numbers 08 or 09.

    zsh -f
    % [ 03 -gt 07 ] && echo ok
    % [ 07 -gt 03 ] && echo ok
    ok
    % [ 07 -gt 07 ] && echo ok
    % [ 08 -gt 07 ] && echo ok
    zsh: bad math expression: unbalanced stack
    % [ 07 -gt 08 ] && echo ok
    zsh: bad math expression: unbalanced stack
    % [ 07 -gt 09 ] && echo ok
    zsh: bad math expression: unbalanced stack

in an effort to stip off the leading zero....

    % let x=01
    % echo $x
    1
    % let x=07
    % echo $x
    7
    % let x=08
    zsh: lvalue required
    % echo $x
    7
    % echo $ZSH_VERSION
    2.6-beta10


(thanks for your work on the best shell out there...)
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Paul Becker              o       Atria Software       main:    508-650-5100
(508)650-5116           /~>     24 Prime Park Way     fax:     508-647-1760
becker@Atria.com     o...(\     Natick, MA  01760  <URL://http:/www.atria.com/>
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New ! Effective September 5, 1995
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Paul Becker              o       Atria Software       main:    617-676-2400
(617)676-2605           /~>     20 Maguire Road       fax:     617-676-2410
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Re: Math expressions with 08 or 09 -> zsh2.6-beta10

[Matt]

> These leading zeros are inconsistent.  Math expressions do not seem to
> like numbers 08 or 09.

i dont know if this actually applies to this instances but ...

just a guess but isnt any number with a leading zero treated as an octal 
number(base 8)?

> 
>     zsh -f
>     % [ 03 -gt 07 ] && echo ok
>     % [ 07 -gt 03 ] && echo ok
>     ok
>     % [ 07 -gt 07 ] && echo ok
>     % [ 08 -gt 07 ] && echo ok
>     zsh: bad math expression: unbalanced stack

in this case the number '08' will be unrecognised...

>     % [ 07 -gt 08 ] && echo ok
>     zsh: bad math expression: unbalanced stack

in this case the number '08' will be unrecognised...


>     % [ 07 -gt 09 ] && echo ok
>     zsh: bad math expression: unbalanced stack

in this case the number '09' will be unrecognised...

> 
> in an effort to stip off the leading zero....
> 
>     % let x=01
>     % echo $x
>     1
>     % let x=07
>     % echo $x
>     7
>     % let x=08
>     zsh: lvalue required

in this case the number '08' will be unrecognised...

>     % echo $x
>     7

dont know about this - but it seems to be regressing to the last 
officially 'valid' set value.... ie '07'

>     % echo $ZSH_VERSION
>     2.6-beta10
> 

now i dont know if what i described is the supposed behaviour or not ...

dont grill me if i am wrong please ....... [my mail box is only so big..!]

matt.


Thought for the Day: Darth Vader sleeps with a Teddywookie.
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