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Definition of "Complement" |
A number or state that is the opposite of a specified number or state. The negative of a number is often represented by its complement. An inversion, a logic gate that outputs a low [or high] when presented with a high [or low]. The circuit diagram to the right shows a buffer that outputs both a true [Y] or complement [inverted] version [Y-bar] output of the input signal. / In mathematics and computing, the method of complement is a technique used to subtract one number from another using only addition of positive numbers. This method was commonly used in mechanical calculators and is still used in modern computers. The nines' complement of a number is formed by replacing each digit with nine minus that digit. To subtract a decimal number y (the subtrahend) from another number x (the minuend), the nines' complement of y is added to x and one is added to the sum. The leading digit '1' of the result is then discarded. Discarding the initial '1' is especially convenient on calculators or computers that use a fixed number of digits: there is nowhere for it to go so it is simply lost during the calculation. The nines' complement plus one is known as the tens' complement. / (1) to swap 1’s for 0’s and 0’s for 1’s in a binary number. |
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