binary - Two's Complement of a number and its negative number difference? -

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so told two's complement used find complement of number , used complement positive numbers (i.e positve --> negative conversion) got example in book asks me following :

express 23, -23, , -9 in 8-bit binary two’s complement form

now mean? 23 means -23 in binary , -23 means 23 ?

sorta confused on there

2's complement used represent negative numbers, in turn, can used subtraction.

23 = 00010111b

to -23 (2's complement of 23), flip bits, , add 1:

 11101000b + 1 =11101001b (-23)

-9 2's complement of 9. 9 is

00001001b

so -9 is

11110111b (flipping , add +1)

see here


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