power-of-2? ( n -- ? )
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Vocabulary
math

Inputs
nan integer


Outputs
?a boolean


Word description
Tests if n is a power of 2.

Definition
USING: kernel ;

IN: math

: power-of-2? ( n -- ? )
dup 0 <= [ drop f ] [ dup 1 - bitand zero? ] if ; foldable
flushable