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| Numeric | | Portability | portable | | Stability | provisional | | Maintainer | libraries@haskell.org |
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| Description |
| Odds and ends, mostly functions for reading and showing
RealFloat-like kind of values.
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| Synopsis |
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| Showing
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| :: 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.
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| Shows a non-negative Integral number using the base specified by the
first argument, and the character representation specified by the second.
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| Show non-negative Integral numbers in base 10.
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| Show non-negative Integral numbers in base 16.
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| Show non-negative Integral numbers in base 8.
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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.
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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.
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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.
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| Show a signed RealFloat value to full precision
using standard decimal notation for arguments whose absolute value lies
between 0.1 and 9,999,999, and scientific notation otherwise.
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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
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| Reading
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| NB: readInt is the 'dual' of showIntAtBase,
and readDec is the `dual' of showInt.
The inconsistent naming is a historical accident.
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| Reads a signed Real value, given a reader for an unsigned value.
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| :: 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.
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| Read an unsigned number in decimal notation.
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| Read an unsigned number in octal notation.
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| Read an unsigned number in hexadecimal notation.
Both upper or lower case letters are allowed.
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| Reads an unsigned RealFrac value,
expressed in decimal scientific notation.
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| Reads a non-empty string of decimal digits.
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| Miscellaneous
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| Converts a Rational value into any type in class RealFloat.
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| Produced by Haddock version 0.9 |
