1/19/2008
Copyright
2005 – Tim Hoerning
21
2’s complement chart
•Consider a 4 bit system as shown in the graph on the left
•Note that the most significant bit is only one for the negative numbers
•Note that the system has one more negative number than positive.
This number is
typically avoided
1000
-8
1001
-7
1010
-6
1011
-5
1100
-4
1101
-3
1110
-2
1111
-1
0000
0
0001
1
0010
2
0011
3
0100
4
0101
5
0110
6
0111
7
2’s
complement
Decimal