ones' complement

English

Noun

ones' complement (plural ones' complements)

1. (computing) The number obtained by subtracting a given n-digit binary number from ${\displaystyle 2^{n}-1}$ (which yields the same result as the logical complement).
The ones' complement of 0xAAAA is 0x5555 on a 16-bit machine, and 0xFFFF5555 on a 32-bit machine.
2. (computing) The convention by which bit patterns with high bit 0 represent positive numbers from 0 to ${\displaystyle 2^{n-1}-1}$ directly, while bit patterns with high bit 1 represent negative numbers from 0 to ${\displaystyle -(2^{n-1}-1)}$, n being the word size of the machine, and the numeric complement of a number is its ones' complement.
Computers that use ones' complement arithmetic have two representations for zero, all 0's and all 1's.

Translations

The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout#Translations.