Question: 49. Implement a four-bit ASL shifter with select line S. The input is A3 A2 A1 A0, which represents a four-bit number with A0 the

49. Implement a four-bit ASL shifter with select line S. The input is A3 A2 A1 A0, which represents a four-bit number with A0 the LSB and A3 the sign bit. The output is B3 B2 B1 B0 and C, the carry bit. If S is 1, the output is the ASL of the input. If S is 0, the output is the same as the input, and C is 0.

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