MHB How Do You Correctly Subtract Using 1's and 2's Complement in Binary?

AI Thread Summary
The discussion centers around the process of subtracting binary numbers using 1's and 2's complement methods. The user initially attempts to subtract 1 from 11 in binary but makes an error in the calculation. They correctly identify that the binary representation must have an equal number of bits, converting 1 to 01 before taking the 1's complement. The user realizes that this adjustment is crucial for accurate subtraction, as it ensures proper alignment of bits during the calculation. The correct approach leads to the expected result of 10 in binary, which equals 2 in decimal.
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i have to subtract binary numbers using the method where you take the 1's complement and then the 2's complement. but I am doing something wrong.

say for example 11-1. take 1's complement of 1 which is 0 and then take the 2's complement by adding 1 so 0+1=1 and now you go back and add this number to 11.

11+1=100 and you ignore the first value (1) and you end up with 00 and i know its TOTALLY messed up i just don't know where i went wrong. i know the actual answer should be 10 (or 2 in decimal)

thanks for any help
 
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oh i see what i did wrong. it needs to be of an equal number of bits so 1 becomes 01 AND THEN i take the 1's comp
 

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