Can add two Hexadecimal digits to give sum upto 15 (f).
The input is in the form of binary representation of the digits. You can find the number you want to give input via this table->
0000 -0
0001 -1
0010-2
0011-3
0100-4
0101-5
0110-6
0111-7
1000-8
1001-9
1010-A(10)
1011-b(11)
1100-C(12)
1101-d(13)
1110-E(14)
1111-F(15)
Give input via the 8 switches on the top if the circuit and you will get the algebric sum of the digits. Hope you can make it better.
