in reply to Re^4: Determining whether a value is zero.
in thread Determining whether a value is zero.

"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.

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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.