How to convert Char to Int in Haskell?

I n开发者_Python百科eed to convert a Char to an Int in Haskell? For example:

a = '\x2' -- a == 2
          -- type of a should be Char
b = charToInt a -- b == 2
                -- type of b should be Int

How can I achieve this?

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You can use the ord function to convert a character to its integer (ordinal) representation.

chr goes the other direction.

> ord '\x2'­
  => 2
> chr 97
  => 'a'
> ord (chr 42)
  => 42

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You can use fromEnum or Data.Char.ord.