17. Binary to Gray Code Converter

How do you plan to solve it?

MSB of the Gray output is identical to the MSB of the binary input. Each subsequent Gray bit is obtained by performing a bitwise XOR between the corresponding binary bit and its immediate higher-order binary bit.

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]};

endmodule