2. Signed Integers Unsigned binary numbers work for natural numbers, but many calculations use negative numbers as well. To deal with this, a number of different schemes have been used to represent signed numbers, but we will focus on two's complement, as it is the standard solution for representing signed integers. 2.1 Two's complement Most significant bit has a negative value, all others are positive. So, the value of an n-digit two's complement number can be written as: complement number can be writen as: 21d, 2dn -0204-2n-ldn .Otherwise exactly the same as unsigned integers. . A neat trick for flipping the sign of a two's complement number: flip all the bits and add 1