<Tr> <Td> 11111111 </Td> <Td> − 0 </Td> <Td> 255 </Td> </Tr> <P> Alternatively, a system known as ones' complement can be used to represent negative numbers . The ones' complement form of a negative binary number is the bitwise NOT applied to it, i.e. the "complement" of its positive counterpart . Like sign - and - magnitude representation, ones' complement has two representations of 0: 00000000 (+ 0) and 11111111 (− 0). </P> <P> As an example, the ones' complement form of 00101011 (43) becomes 11010100 (− 43). The range of signed numbers using ones' complement is represented by − (2 − 1) to (2 − 1) and ± 0 . A conventional eight - bit byte is − 127 to + 127 with zero being either 00000000 (+ 0) or 11111111 (− 0). </P> <P> To add two numbers represented in this system, one does a conventional binary addition, but it is then necessary to do an end - around carry: that is, add any resulting carry back into the resulting sum . To see why this is necessary, consider the following example showing the case of the addition of − 1 (11111110) to + 2 (00000010): </P>

Range of signed integers represented by 8 bits
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