How to print integer literals in binary or hex in haskell?

Question

How to print integer literals in binary or hex in haskell?

printBinary 5 => \"0101\"

printHex 5 => \"05\"

Which libraries/functions allo

Answer 1

Hex can be written with 0x and binary with 0b prefix e.g.:

> 0xff
255
>:set -XBinaryLiterals
> 0b11
3

Note that binary requires the BinaryLiterals extension.

Answer 2

You can convert integer to binary with something like the following:

decToBin x = reverse $ decToBin' x
  where
    decToBin' 0 = []
    decToBin' y = let (a,b) = quotRem y 2 in [b] ++ decToBin' a

usage in GHCi:

Prelude> decToBin 10
[1,0,1,0]