bits ( m n -- m' ) - Factor Documentation

bits ( m n -- m' )
Factor handbook » The language » Numbers » Arithmetic » Bitwise arithmetic » Additional bitwise arithmetic

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Vocabulary
math.bitwise

Inputs

m	an integer
n	an integer

Outputs

m'	an integer

Word description
Keep only n bits from the integer m. For negative numbers, represent the number as two's complement (a positive integer representing a negative integer).

Examples

USING: math.bitwise prettyprint ; 0x123abcdef 16 bits .h
0xcdef

USING: math.bitwise prettyprint ; -2 16 bits .h
0xfffe