这段代码中有错误，指出来并改正

这段代码中有几个语法错误，指出来并改正：

1. 在 ENTITY 定义中，BIN2 应该改为 BIN。

2. 在 PROCESS 过程块中，ELSE 后面有分号，应该去掉分号。

下面是改正后的代码：

USE IEEE.STD_LOGIC_1164.ALL;

ENTITY BIN IS
    PORT (
        BIN_IN : IN STD_LOGIC_VECTOR(3 DOWNTO 0);
        BCD_OUT : OUT STD_LOGIC_VECTOR(4 DOWNTO 0)
    );
END BIN;

ARCHITECTURE A OF BIN IS
BEGIN
    PROCESS
    BEGIN
        CASE BIN_IN IS
            WHEN "0000" => BCD_OUT <= "00000";
            WHEN "0001" => BCD_OUT <= "00001";
            WHEN "0010" => BCD_OUT <= "00010";
            WHEN "0011" => BCD_OUT <= "00011";
            WHEN "0100" => BCD_OUT <= "00100";
            WHEN "0101" => BCD_OUT <= "00101";
            WHEN "0110" => BCD_OUT <= "00110";
            WHEN "0111" => BCD_OUT <= "00111";
            WHEN "1000" => BCD_OUT <= "01000";
            WHEN "1001" => BCD_OUT <= "01001";
            WHEN "1010" => BCD_OUT <= "10000";
            WHEN "1011" => BCD_OUT <= "10001";
            WHEN "1100" => BCD_OUT <= "10010";
            WHEN "1101" => BCD_OUT <= "10011";
            WHEN "1110" => BCD_OUT <= "10100";
            WHEN "1111" => BCD_OUT <= "00000";
            WHEN OTHERS => BCD_OUT <= "00000";
        END CASE;
    END PROCESS;
END A;

改正后的代码使用 CASE 语句来替代 IF 语句，同时修正了 ENTITY 的名称和 PROCESS 中的语法错误。