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Explain Twos-complement notation

Twos-complement notation: In twos-complement notation, the most noteworthy bit in an integer value is employed as the sign bit. A 1 bit points out a negative number, and a 0 bit points out a positive number. The positive number can be transformed to its negative value by complementing the bit pattern and adding up 1. The similar operation is employed to transform a negative value to its equivalent positive.

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