in reply to In What basis the subroutine return values assign to variables ?
|| is causing get_price_floor() to be evaluated in scalar context. A list eg (10, 8), when evaluated in scalar context, returns the last element, 8. That's what's assigned to $price, while $floor is left undefined.
Simple solution: get rid of || 0
BTW, do you know what & does to a subroutine call? If you don't (and I don't believe you do), don't use it. Just call your subroutine without it:
my ($price, $floor) = get_price_floor();
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