Re^3: Determining whether a value is zero.

It works as per the OP's spec. Don't blame me for his spec being awful!

For strings,

0+$x;   #Upd: Or 1.1 or whatever
[download]

is effectively

$x = dualvar(0+$x, $x) if looks_like_number($x);
[download]

The OP was clear that dualvar(0, $anything) should be considered zero.

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Re^4: Determining whether a value is zero. by choroba (Cardinal) on Mar 11, 2011 at 09:34 UTC
~~dualvar 0,~~"0 " is considered zero after the assignment to $y in my code. That is against the specification I fear... UPDATE: corrected.	[reply]
Re^5: Determining whether a value is zero. by JavaFan (Canon) on Mar 11, 2011 at 10:21 UTC
No. In fact, after your initial reply, I particular pointed out that your first code incorrectly considers `dualvar 0, "0 "` to be not be a zero. `dualvar 0, ANYTHING` should be considered a zero.	[reply] [d/l] [select]
Re^6: Determining whether a value is zero. by choroba (Cardinal) on Mar 11, 2011 at 10:40 UTC
Sorry, updated the previous post.	[reply]
Re^5: Determining whether a value is zero. by ikegami (Patriarch) on Mar 11, 2011 at 18:11 UTC
"0 " is considered zero after the assignment to $y in my code You never test `"0 "` after the assignment to $y. You test `dualvar(0, "0 ")`. Please re-read my post.	[reply] [d/l] [select]
Re^6: Determining whether a value is zero. by choroba (Cardinal) on Mar 11, 2011 at 22:32 UTC
Oh I see! You are right.	[reply]