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4-4) Fill in the truth table below, build your circuit and test it for those six cases. Adder-Subtractor Truth Table Input ExFill the truth table .

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Answer #1
A4,A3,A2,A1 SIgn of B B4,B3,B2,B1 C4 S4 S3 S2 S1
1 0 0 1 + 0 1 0 1 0 1 1 1 0
1 0 0 1 - 0 1 0 1 0 0 1 0 0
1 0 0 1 + 1 0 0 1 1 0 0 1 0
1 0 0 1 - 1 0 0 1 0 0 0 0 0
1 0 0 1 + 1 1 1 1 1 1 0 0 0
1 0 0 1 - 1 1 1 1 1 1 0 1 0

Addition Truth table

A B sum carry

0 0 0 0

0 1   1 0

1 0 1 0

1 1 1 1

Subtraction Truth table

A B DIff Borrow

0 0 0 0

0 1   1 1

1 0 1 0

1 1 0   0

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