Half Adder And Subtractor

Half Adder (HA):

Half adder is a combinational arithmetic circuit that adds two numbers and produces a SUM bit (s) and CARRY bit (c) both as output.

Sum = A XOR B

Carry = A AND B

Half Subtractor (HS):

It produces the DIFFERENCE between the two binary bits at the input and also produces an output (BORROW) to indicate if a 1 has been borrowed.

Diff= A’B+AB’

Borrow = A’B