Implement Half Adder, Full Adder, Half Subtractor and Full Subtractor.

Inputs for Half Adder and Half Subtractor

A=0, B=1

Inputs for Full Adder and  Full Subtractor

A=0, B=1, C=1

Output of Half Adder

Sum S= 1, Carry C=0

Output of Half Subtractor

Diff D= 1, Borrow Bo =1

Output of Full Adder

Sum S= 0, Carry C=1

Output of Full Subtractor

Diff D= 0, Borrow Bo =1