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- Arithmetic Operator (2)
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library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity adder is
port (
a,b,c,d : in std_logic_vector(3 downto 0);
y : out std_logic_vector(3 downto 0)
);
end adder;
architecture a_adder of adder is
begin
y <= a + b + c + d;
end a_adder;