 | Haskell Hierarchical Libraries (base package) | Contents | Index |
| Numeric |
|
| Contents |
| showSigned :: Real a => (a -> ShowS) -> Int -> a -> ShowS |
| showIntAtBase :: Integral a => a -> (Int -> Char) -> a -> ShowS |
| showInt :: Integral a => a -> ShowS |
| showHex :: Integral a => a -> ShowS |
| showOct :: Integral a => a -> ShowS |
| showEFloat :: RealFloat a => Maybe Int -> a -> ShowS |
| showFFloat :: RealFloat a => Maybe Int -> a -> ShowS |
| showGFloat :: RealFloat a => Maybe Int -> a -> ShowS |
| showFloat :: RealFloat a => a -> ShowS |
| floatToDigits :: RealFloat a => Integer -> a -> ([Int], Int) |
| readSigned :: Real a => ReadS a -> ReadS a |
| readInt :: Num a => a -> (Char -> Bool) -> (Char -> Int) -> ReadS a |
| readDec :: Num a => ReadS a |
| readOct :: Num a => ReadS a |
| readHex :: Num a => ReadS a |
| readFloat :: RealFrac a => ReadS a |
| lexDigits :: ReadS String |
| fromRat :: RealFloat a => Rational -> a |
| :: Real a | |
| => (a -> ShowS) | a function that can show unsigned values |
| -> Int | the precedence of the enclosing context |
| -> a | the value to show |
| -> ShowS | |
| Converts a possibly-negative Real value to a string. | |
Show a signed RealFloat value using scientific (exponential) notation (e.g. 2.45e2, 1.5e-3).
In the call showEFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then at most d digits after the decimal point are shown.
Show a signed RealFloat value using standard decimal notation (e.g. 245000, 0.0015).
In the call showFFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then at most d digits after the decimal point are shown.
Show a signed RealFloat value using standard decimal notation for arguments whose absolute value lies between 0.1 and 9,999,999, and scientific notation otherwise.
In the call showGFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then at most d digits after the decimal point are shown.
floatToDigits takes a base and a non-negative RealFloat number, and returns a list of digits and an exponent. In particular, if x>=0, and
floatToDigits base x = ([d1,d2,...,dn], e)
then
n >= 1
x = 0.d1d2...dn * (base**e)
0 <= di <= base-1
| :: Num a | |
| => a | the base |
| -> (Char -> Bool) | a predicate distinguishing valid digits in this base |
| -> (Char -> Int) | a function converting a valid digit character to an Int |
| -> ReadS a | |
| Reads an unsigned Integral value in an arbitrary base. | |