Combinational circuits- 2of4 Decoder

2 OUT OF 4 DECODER
module decoder2of4(out,in);
output[3:0]out;
input [1:0]in;
reg [3:0]out;
always @(in)
begin
case(in)
2'b00:out=4'b1000;
2'b01:out=4'b0100;
2'b10:out=4'b0010;
2'b11:out=4'b0001;
endcase
end
endmodule