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Please help me!

BCD number here given  are positive(0 -9) and we know that the 9’s complement of a positive number is that number itself. Then why they have subtracted each BCD number from 9?

And suppose if I take the 9’s complement of a number for instance “7” that would be 2. Doesn't it means that 2 represent a negative number that is -7? 

in Digital Logic by (17 points) | 35 views

1 Answer

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How to find 9’s complement of a number

let number = 453

9’s complement of 453 →      999 – 453 = 546

similarly 9’s complement of 7 →        9 – 7 = 2

here 10 to 15 are decimal digits so 6 numbers has don’t care and none have negative value

so 6 – 0 = 6 will be the answer
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