JK Flip-Flop with the help of 'Variable'

library ieee;
use ieee.std_logic_1164.all;

entity jkff is
port(j,k,pr,clr,clk: in std_logic;
q:out std_logic:='0');
end jkff;

architecture behavioral of jkff is
begin

process(clk)
variable temp:std_logic;
begin
if clk='1' and clk' event then
if pr='0' then temp:='1';
elsif clr='0' then temp:='0';
elsif j/=k then temp:=j;
elsif j='1' then temp:=not temp;
else temp:=temp;
end if;
q<=temp;
end if;
end process;

end behavioral;