69. Binary Subtractor

How do you plan to solve it?

/*Write your code here*/
module sub4_2c(

input [3:0] a,b,
output [3:0] diff,
output bout
);

 
    
    assign diff = a + (~b) + 1;
    assign bout = (a>=b) ? 1'b0 : 1'b1;
 

 
      


endmodule