17. Binary to Gray Code Converter

How do you plan to solve it?

module bin2gray4 (
    input [3:0]bin_in,
    output [3:0]gray_out
);
//assign gray_out = {bin_in[3], bin_in[3]^bin_in[2], bin_in[2]^bin_in[1], bin_in[1]^bin_in[0]};
assign gray_out = bin_in ^(bin_in >> 1);
endmodule