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

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The Numeric module includes several functions for showing an Integral type at various bases, including showIntAtBase. Here are some examples of use:

import Numeric (showHex, showIntAtBase)
import Data.Char (intToDigit)

putStrLn $ showHex 12 "" -- prints "c"
putStrLn $ showIntAtBase 2 intToDigit 12 "" -- prints "1100"

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