Example 3: Adder 111111000000103 JULI 1 2 Solution 2: out=INTEGER LIBRARY ieee; USE ieee.std_logic_1164.all; USE ieee.std_logic_arith.all; 3 4 5 6 ENTITY adder2 IS 7 PORT (a, b: IN SIGNED (3 DOWNTO 0); 8 sum: OUT INTEGER RANGE -16 TO 15); 9 END adder2; 10 11 ARCHITECTURE adder2 OF adder2 IS 12 BEGIN 13 sum