How do you plan to solve it?
module jk_ff ( input CLK, input J, input K, output reg Q ); // Write your code here always @(posedge CLK) begin case ({J, K}) 2'b00 : Q<= Q; 2'b01 : Q<=1'b0; 2'b10 : Q <=1'b1; 2'b11 : Q <= ~Q; endcase end endmodule