17. Binary to Gray Code Converter

How do you plan to solve it?

/*Write your code here*/
module bin2gray4(
    input [3:0] bin_in,
    output reg [3:0] gray_out
);
    reg [3:0] i;
    always @(*) begin
        for (i = 0; i < 3; i = i + 1) begin
            gray_out[i] = bin_in[i+1] ^ bin_in[i]; 
        end
        gray_out[3] = bin_in[3];
    end
endmodule