Question: Compare the complexity of the circuits in problems I and II. Which of these circuits is faster?
Problems I: Two two-bit numbers are to be added. Design a circuit with the two numbers as inputs and their sum as the output.
Problems II: Connect a full adder and a half-adder to form the sum of two two-bit numbers. Note that one of the inputs to the full adder is treated as the CARRY-IN along with the other two input bits to be added to produce the two outputs :sum and carry-out.