Half  AdderA Halfadder circuit needs two binary inputs and two binary outputs. The input variable shows the augend and addend bits whereas the output variable produces the sum and carry. We can understand the function of a halfadder by formulating a truth table. The truth table for a halfadder is:
The simplified sum of products (SOP) expressions is: S = x'y+xy', C = xy The logic diagram for a halfadder circuit can be represented as:
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