12. NumExts

The NumExts interface collect together various numeric operations that have proven to be commonly useful

-- Going between Doubles and Floats:
doubleToFloat :: Double -> Float
floatToDouble :: Float  -> Double

showHex       :: Integral a => a -> ShowS
showOct       :: Integral a => a -> ShowS

Notes:

• If doubleToFloat is applied to a Double that is within the representable range for Float, the result may be the next higher or lower representable Float value. If the Double is out of range, the result is undefined.
• No loss of precision occurs in the other direction with floatToDouble, the floating value remains unchanged.
• showOct and showHex will prefix 0o and 0x respectively. Like Numeric.showInt, these show functions work on positive numbers only.