Using the leftmost bit of a number to represent the sign, with 0 meaning positive and 1 meaning negative is termed sign/magnitude notation.
If the sign bit is set to "0," the number is positive and is represented as a signed binary integer using the sign-magnitude notation. The number is negative if the sign bit is set to "1". Use of the complement of the negative number is more practical when doing binary arithmetic operations.
Negative numbers can be expressed in a number of ways, including sign and magnitude. This method uses the sign bit, which is located at the far left of the bit pattern, to determine whether the number is positive or negative. The remaining bits in the pattern are used to store the number's size (called its magnitude).
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