Conversion to and from the decimal system can be done easily.
It is a 8-4-2-1 weighted code
Both (a) and (b)
Complement of a number can be found efficiently
8
9
7
11
0.101
1.0111
-0.1101
1.011
7516
6516
5.00E+16
1016
(6B3)16
(16 B)16
(A0B)16
(A6B)16