To the right is a table of 4bit binary numbers in 1's complement notation.
Notice that all of the negative values begin with a 1. Whenever we use
1's complement notation, the most significant bit always tells us the
sign of the number. The only exception to this rule is 0. In 1's complement,
we have two ways of representing the number zero. Notice also that the
values +0 to +7 are the same as the normal binary representation. Only
the negative values must be complemented. You should verify for yourself
that these negative values are correct by using the steps below to produce
this table.

Binary
0111
0110
0101
0100
0011
0010
0001
0000
1111
1110
1101
1100
1011
1010
1001
1000

Decimal
+7
+6
+5
+4
+3
+2
+1
+0
0
1
2
3
4
5
6
7

