>signed ( x n -- y )
Factor handbook » The language » Numbers » Arithmetic » Bitwise arithmetic » Additional bitwise arithmetic

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Vocabulary
math.bitwise

Inputs

x	an integer
n	an integer

Outputs

y	an integer

Examples

USING: math.bitwise prettyprint ; 0xff 8 >signed .
-1

USING: math.bitwise prettyprint ; 0xf0 4 >signed .
0

Word description
Interprets a number x as an n-bit number and converts it to a negative number if the topmost bit is set.

See also
bits

Definition

USING: kernel math ;

IN: math.bitwise

: >signed ( x n -- y )
    [ bits ] keep 2dup 1 - bit? [ 2^ - ] [ drop ] if ; inline