69. Binary Subtractor

How do you plan to solve it?

/*Write your code here*/
module sub4_2c( input [3:0] a,
                input [3:0]b,
                output  [3:0] diff,
                output  bout);

    
    assign diff = a -b;
    assign bout = ( a < b) ? 1'b1 : 1'b0;
    

endmodule