44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(bus,all_known,has_unknown,bus_if_known);
input [7:0]bus;
output all_known,has_unknown;
output [7:0]bus_if_known;
assign all_known=(0/1)?1:0;
assign has_unknown=(x or z)?1:0;
assign bus_if_known=(all_known)?1:8'h00;
endmodule