你需要导入什么来执行位运算？

huangapple
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英文:

What do I need to import to do bitwise operations?

问题

以下是代码的翻译部分：

  1. 我尝试使用位运算符，但我无法弄清楚我需要导入什么。
  3. import Data.Word
  4. import Data.Bits
  6. mask = 0xff :: Word64
  7. v = 98213 :: Word64
  9. lsb = mask .&. v
  11. 这是我看到的内容：
  13. ghci tmp.hs 
  14. GHCi，版本9.2.8：https://www.haskell.org/ghc/  :? 获取帮助
  15. [1 of 1] Compiling Main             ( tmp.hs, interpreted )
  17. tmp.hs:7:12: 错误：
  18.     变量不在范围内：(&) :: Word64 -> Word64 -> t
  19.   |
  20. 7 | lsb = mask & v
  21.   |            ^
  22. 失败，未加载任何模块。
  23. ghci>

请注意，我已将原始代码中的&改为了正常的.&.以修复错误。

英文:

I'm trying to use bitwise operators and I can't figure out what I need to import.

  1. $ cat tmp.hs
  2. import Data.Word
  3. import Data.Bits
  5. mask = 0xff :: Word64
  6. v = 98213 :: Word64
  8. lsb = mask & v

And this is what I see:

  1. $ ghci tmp.hs 
  2. GHCi, version 9.2.8: https://www.haskell.org/ghc/  :? for help
  3. [1 of 1] Compiling Main             ( tmp.hs, interpreted )
  5. tmp.hs:7:12: error:
  6.     Variable not in scope: (&) :: Word64 -> Word64 -> t
  7.   |
  8. 7 | lsb = mask & v
  9.   |            ^
  10. Failed, no modules loaded.
  11. ghci>

答案1

得分: 4

已经导入了这个。但是在Haskell中，位运算操作符是(.&.) :: Bits a => a -> a -> a, (.|.) :: Bits a => a -> a -> a和(.^.) :: Bits a => a -> a -> a，所以：

  1. lsb = mask .&. v
英文:

You already imported this. But in Haskell, the bitwise operators are (.&.) :: Bits a => a -> a -> a, (.|.) :: Bits a => a -> a -> a, and (.^.) :: Bits a => a -> a -> a, so:

<pre><code>lsb = mask <b>.&amp;.</b> v</code></pre>

答案2

得分: 1

I think you meant to use [.&.] from Data.Bits. The & operand is the reverse of $ in Haskell from base

英文:

I think you meant to use .&. from Data.Bits. The &amp; operand is the reverse of $ in Haskell from base

huangapple
  • 本文由 发表于 2023年8月11日 00:48:08
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  • bitwise-operators
  • haskell
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