各位大侠，这是怎么回事啊？ 大侠

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程序是书上的例子，怎么会显示如下错误啊，错误不知怎么改啊？大家帮帮我啊，先谢过了

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entity box2 is
port(S:in std_logic_vector(3 downto 0);
Mut std_logic_vector(3 downto 0));
end box2;

architecture Behavioral of box2 is

begin
with S select
M<="1111" when "0001",
"1110" when "0010",
"1101" when "0011",
"1100" when "0100",
"1011" when "0101",
"1010" when "0110",
"1001" when "0111",
"1000" when "1000",
"0111" when "1001",
"0110" when "1010",
"0101" when "1011",
“0100" when "1100",
"0011" when "1101",
"0010" when "1110",
"0001" when "1111",
"0000" when others; 

end Behavioral;

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显示的错误是下面

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=========================================================================
* HDL Compilation *
=========================================================================
Compiling vhdl file "D:/PLL/box2.vhd" in Library work.
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 39. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 39. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 40. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 40. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 42. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 42. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 43. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 43. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 44. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 44. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 45. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 45. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 46. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 46. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 47. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 47. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 48. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 48. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 49. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 49. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 50. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 50. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 51. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 51. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 52. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 52. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 53. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 53. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 54. Unexpected symbol read: ?
ERROR: XST failed
Process "Check Syntax" did not complete.

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哦，实在抱歉，呵呵，我刚三次单独发的，实在抱歉，论坛应该每错误的

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哦，实在抱歉，呵呵，我刚三次单独发的，实在抱歉，论坛应该每错误的

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哦，实在抱歉，呵呵，我刚三次单独发的，实在抱歉，论坛应该每错误的

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错误显示里的39行是M<="1111" when "0001",
54行是指"0000" when others; 小女实在是不知从哪里下手改啊，望各位不吝赐教。谢谢拉

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试过了，还是这样的问题啊，每办法啊。有谁知道的吗？

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错误显示的是什么意思啊，各位大侠给侃侃啊，谢谢先。

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是的，我用的是ISE7。1，那我试试

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stone133斑竹，不行啊，你改过的好象和我发的哪个有问题的程序是一样 的啊，怎么回师？

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可是怎么回是，我这连syntax着一关就出先这么多错误，感觉错误又无从下手啊，难道是我的软件有问题吗？敬请不另赐教。