4 bit comparator -behavioural

--libraries to be used are specified here
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

--entity declaration with port definitions
entity compare is
port( num1 : in std_logic_vector(3 downto 0); --input 1
num2 : in std_logic_vector(3 downto 0); --input 2
less : out std_logic; -- indicates first number is small
equal : out std_logic; -- both are equal
greater : out std_logic -- indicates first number is bigger
);
end compare;

--architecture of entity
architecture Behavioral of compare is

begin
process(num1,num2)
begin -- process starts with a 'begin' statement
if (num1 > num2 ) then --checking whether num1 is greater than num2
less <= '0';
equal <= '0';
greater <= '1';
elsif (num1 < num2) then --checking whether num1 is less than num2
less <= '1';
equal <= '0';
greater <= '0';
else --checking whether num1 is equal to num2
less <= '0';
equal <= '1';
greater <= '0';
end if;
end process; -- process ends with a 'end process' statement

end Behavioral;