Check the least significant bit. It is set for odd numbers:

print "$_ is " . ($_ & 1 ? "odd" : "even") . "\n" for 0..3;

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Prints:

0 is even
1 is odd
2 is even
3 is odd

[download]
DWIM is Perl's answer to Gödel

In reply to Re: Check even numbers? by GrandFather
in thread Check even numbers? by Anonymous Monk

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