Debug: 4-Bit Ripple Carry Adder
A 4-bit ripple carry adder computes the sum of two 4-bit numbers and an initial carry-in.
Expected behavior:
The outputs Sum and Cout must represent the arithmetic sum A + B + Cin.
Simulation shows Sum = 0 and Cout = 0 for inputs A = 2, B = 2, and Cin = 0. The expected sum is 4. Inspect the circuit and correct the fault.
Constraints
- Identify and correct the structural fault in the circuit.
- Do not change the internal logic of the full adder sub-components.
Topics
Solve this problem
Place the gates, wire them up and watch the signals settle. Every submission runs on the same simulation engine that grades it.
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