Think of it another way.
my $value = get_numeric_value_from_somewhere();
print 'Will always be printed' if ($value/$value) == 1;
# Except for zero!!
the above is true, for 1/1; -1/-1; .1/.1; -.1/-.1; etc. etc. all the way down to the smallest values on either side of zero that any given machine can represent.
Out of interest, after I posted I did a quick google on the net and discovered that at least one computer langauge treats 0/0 as 1. Namely APL, which as its a language essentially designed for mathematical problem solving, at least makes me feel a little better regarding the notion, even if ultimately 0/0=1 isn't correct in the pure math sense.
Cor! Like yer ring! ... HALO dammit! ... 'Ave it yer way! Hal-lo, Mister la-de-da. ... Like yer ring!
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