Half Adder
The Combinational circuit that performs arithmetic addition of two binary digits is called half adder. Variables that are supplied to input of half adder are called augend and addend. The Output obtained is sum and carry. Figure given below shows logical and symbolic representation of half adder.
S= A'B +AB'
C=AB
Full Adder
It is the Combinational Circuit that performs addition of three input bits.Three inputs are supplied and result is obtained by two output lines. A and B are operands and Cin is a bit carried in from the next less significant stage.Output is obtained as S,which gives the value of least significant bit of sum, and Cout which gives output carry.
Truth Table is as Follows:
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