LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY hour IS
  PORT(clk,clear:IN STD_LOGIC;
       cout:BUFFER STD_LOGIC_VECTOR(4 DOWNTO 0));
END hour;
ARCHITECTURE behave OF hour IS
  BEGIN
    PROCESS(clk,clear)
  BEGIN
   if(clear='1')then
   cout<="00000";
   elsif(clk'EVENT AND clk='0')THEN
       if(cout=23)then
       cout<="00000";
       else cout<=cout+1;
       END IF;
   end if;
  END PROCESS;
END behave;