float man page on Solaris

Man page or keyword search:  
man Server   20652 pages
apropos Keyword Search (all sections)
Output format
Solaris logo
[printable version]

float.h(3HEAD)			    Headers			float.h(3HEAD)

NAME
       float.h, float - floating types

SYNOPSIS
       #include <float.h>

DESCRIPTION
       The  characteristics  of floating types are defined in terms of a model
       that describes a representation of floating-point  numbers  and	values
       that  provide  information  about  an  implementation's	floating-point
       arithmetic.

       The following parameters are used to define the model for  each	float‐
       ing-point type:

       s	sign (±1)

       b	base or radix of exponent representation (an integer >1)

       e	exponent  (an  integer	between	 a  minimum emin and a maximum
		emax)

       p	precision (the number of base-b digits in the significand)

       fk	non-negative integers less than b (the significand digits)

       In addition to normalized floating-point numbers (f1>0 if x≠0),	float‐
       ing  types  might be able to contain other kinds of floating-point num‐
       bers, such as subnormal floating-point numbers (x≠0, e=emin, f1=0)  and
       unnormalized  floating-point  numbers  (x≠0,  e=emin, f1=0), and values
       that are not floating-point numbers, such as infinities and NaNs. A NaN
       is  an encoding signifying Not-a-Number. A quiet NaN propagates through
       almost every arithmetic	operation  without  raising  a	floating-point
       exception;  a signaling NaN generally raises a floating-point exception
       when occurring as an arithmetic operand.

       The accuracy  of	 the  library  functions  in  math.h(3HEAD)  and  com‐
       plex.h(3HEAD)  that  return  floating-point  results  is defined on the
       libm(3LIB) manual page.

       All integer values in the <float.h> header, except FLT_ROUNDS, are con‐
       stant expressions suitable for use in #if preprocessing directives; all
       floating values	are  constant  expressions.  All  except  DECIMAL_DIG,
       FLT_EVAL_METHOD,	 FLT_RADIX, and FLT_ROUNDS have separate names for all
       three floating-point types. The floating-point model representation  is
       provided for all values except FLT_EVAL_METHOD and FLT_ROUNDS.

       The  rounding  mode for floating-point addition is characterized by the
       value of FLT_ROUNDS:

       -1	Indeterminable.

       0	Toward zero.

       1	To nearest.

       2	Toward positive infinity.

       3	Toward negative infinity.

       The values of operations with floating operands and values  subject  to
       the  usual  arithmetic conversions and of floating constants are evalu‐
       ated to a format whose  range  and  precision  might  be	 greater  than
       required by the type. The use of evaluation formats is characterized by
       the architecture-dependent value of FLT_EVAL_METHOD:

       -1	Indeterminable.

       0	Evaluate all operations and constants just to  the  range  and
		precision of the type.

       1	Evaluate  operations and constants of type float and double to
		the range and precision of the double type; evaluate long dou‐
		ble operations and constants to the range and precision of the
		long double type.

       2	Evaluate all operations and constants to the range and	preci‐
		sion of the long double type.

       The values given in the following list are defined as constants.

	 ·  Radix of exponent representation, b.

	    FLT_RADIX

	 ·  Number of base-FLT_RADIX digits in the floating-point significand,
	    p.

	    FLT_MANT_DIG
	    DBL_MANT_DIG
	    LDBL_MANT_DIG

	 ·  Number of decimal digits, n, such that any	floating-point	number
	    in the widest supported floating type with pmax radix b digits can
	    be rounded to a floating-point number with n  decimal  digits  and
	    back again without change to the value.

	    DECIMAL_DIG

	 ·  Number  of	decimal digits, q, such that any floating-point number
	    with q decimal digits can be rounded into a floating-point	number
	    with p radix b digits and back again without change to the q deci‐
	    mal digits.

	    FLT_DIG
	    DBL_DIG
	    LDBL_DIG

	 ·  Minimum negative integer such that FLT_RADIX raised to that	 power
	    minus 1 is a normalized floating-point number, emin.

	    FLT_MIN_EXP
	    DBL_MIN_EXP
	    LDBL_MIN_EXP

	 ·  Minimum  negative  integer such that 10 raised to that power is in
	    the range of normalized floating-point numbers.

	    FLT_MIN_10_EXP
	    DBL_MIN_10_EXP
	    LDBL_MIN_10_EXP

	 ·  Maximum integer such that FLT_RADIX raised to that power  minus  1
	    is a representable finite floating-point number, emax.

	    FLT_MAX_EXP
	    DBL_MAX_EXP
	    LDBL_MAX_EXP

	 ·  Maximum  integer such that 10 raised to that power is in the range
	    of representable finite floating-point numbers.

	    FLT_MAX_10_EXP
	    DBL_MAX_10_EXP
	    LDBL_MAX_10_EXP

       The values given in the following list are defined as constant  expres‐
       sions with values that are greater than or equal to those shown:

	 ·  Maximum representable finite floating-point number.

	    FLT_MAX
	    DBL_MAX
	    LDBL_MAX

       The  values given in the following list are defined as constant expres‐
       sions with implementation-defined (positive) values that are less  than
       or equal to those shown:

	 ·  The	 difference  between 1 and the least value greater than 1 that
	    is representable in the given floating-point type, b**1 - p.

	    FLT_EPSILON
	    DBL_EPSILON
	    LDBL_EPSILON

	 ·
	    Minimum normalized positive floating-point number, b**emin**-.

	    FLT_MIN
	    DBL_MIN
	    LDBL_MIN

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       complex.h(3HEAD), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.10			  17 Dec 2003			float.h(3HEAD)
[top]

List of man pages available for Solaris

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net