How do you plan to solve it?
a simple JK FF
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 <= 0; 2'b10 : Q <= 1; 2'b11 : Q <= ~Q; default : Q <= 1'bx; endcase end endmodule