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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;


entity 98 is
Port ( a : in STD_LOGIC_VECTOR (3 downto 0);
b : out STD_LOGIC_VECTOR (6 downto 0));
end 98;

architecture Behavioral of 98 is

begin

with a select
b<= "1111110" when a = "0000" else
"0110000" when a = "0001"
else
"1101101" when a ="0010"
else
"1111001" when a="0011"
else
"0110011" when a="0100"
else
"1011011" when a="0101"
else
"1011111" when a="0110"
else
"1110000" when a="0111"
else
"1111111" when a="1000"
else
"1111011" when a="1001"
else
"1110111" when a="1010"
else
"0011111" when a="1011"
else
"1001110" when a="1100"
else
"0111101" when a="1101"
else
"1001111" when a="1110"
else
"1000111" when a="1111";

end Behavioral;

 

Behavioral should be behavior or behaviour.