module ALU (Ain, Bin, ALUop, ALUout, ALUout_status);

input [15:0] Ain,Bin;
input [1:0] ALUop;
output ALUout;
output reg [15:0] ALUout_status;

always @(*) begin
case(ALUop)
2'b00: ALUout_status = Ain + Bin;
2'b01: ALUout_status = Ain - Bin;
2'b10: ALUout_status = Ain & Bin;
2'b11: ALUout_status = ~Bin;
endcase
  end

assign ALUout= |ALUout_status;


endmodule