Question: Modify your 4-bit adder to become a 4-bit adder/subtractor (see slide adders- 8). Your adder/subtractor has an additional input signal, subtract. If subtract = 0,

Modify your 4-bit adder to become a 4-bit adder/subtractor (see slide adders-

8). Your adder/subtractor has an additional input signal, subtract. If subtract = 0,

the circuit adds A + B. If subtract = 1, the circuit subtracts A B. Simulate the

operation as above, but with the subtract signal low for the first half and high for

the second half. This uses Quartus Prime Program.

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