0 votes 0 votes How do we perform 0 – 1 in 2’s complement subtraction using 1-bit register?? CO and Architecture co-and-architecture number-system + – Doraemon asked Mar 21, 2019 retagged Jul 7, 2022 by Shubham Sharma 2 Doraemon 498 views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply srestha commented Mar 21, 2019 reply Follow Share $0-1=-1$ if u want to represent in $1$ bit, then sign bit not shown, only 1 will be in result 0 votes 0 votes Doraemon commented Mar 21, 2019 reply Follow Share For 0 - 1 Using 2's complement in we could represent only -1 and 0 when no of bits=1. The 2's complement of 1 is 1 and when we add 0 with 2's complement of 1 then we get1 as the answer and no carry and that is why we have a borrow of 1?? 0 votes 0 votes srestha commented Mar 21, 2019 reply Follow Share Result should be in 1 bit right? So, first do subtraction then do 2's complement and then take 1 rightmost bit as result 0 votes 0 votes Please log in or register to add a comment.