Find 9''s complement for decimal number, Computer Engineering

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Q. Find 9's complement for decimal number?

The 9's complement is achieved by subtracting every digit of number from 9 (the highest digit value). Let's assume that we want to signify a maximum of four decimal digit number range. 9's complement may be used for BCD numbers.

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In the same way for computing 1's complement for a binary number we must subtract every binary digit of number from digit 1.

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