17. Binary to Gray Code Converter

How do you plan to solve it?

module bin2gray4(input [3:0] bin_in,output reg [3:0] gray_out);
always @(*) begin
    gray_out[3]=bin_in[3];
    gray_out[2]=bin_in[3]^bin_in[2];
    gray_out[1]=bin_in[2]^bin_in[1];
    gray_out[0]=bin_in[1]^bin_in[0];
end
endmodule