module mux_3bit_2to1 (
  sel,
  in0,
  in1,
  out,
);

input  [2:0] in0, in1 ;
input  sel ;
output [2:0] out ;

reg [2:0] out;

initial
begin
   out=3'bzzz;
end


always@(sel or in0 or in1)
   case(sel)
    0:  begin
          out=in0;
        end
    1:  begin
          out=in1;
        end
    default: $display("%m Unknown value of select: %hh", sel);
    endcase

endmodule