This is libquadmath.info, produced by makeinfo version 4.13 from
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Copyright (C) 2010-2013 Free Software Foundation, Inc.
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INFO-DIR-SECTION GNU Libraries
START-INFO-DIR-ENTRY
* libquadmath: (libquadmath). GCC Quad-Precision Math Library
END-INFO-DIR-ENTRY
This manual documents the GCC Quad-Precision Math Library API.
Published by the Free Software Foundation 51 Franklin Street, Fifth
Floor Boston, MA 02110-1301 USA
Copyright (C) 2010-2013 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License,
Version 1.2 or any later version published by the Free Software
Foundation; with no Invariant Sections, with the Front-Cover Texts
being "A GNU Manual," and with the Back-Cover Texts as in (a)
below. A copy of the license is included in the section entitled
"GNU Free Documentation License."
(a) The FSF's Back-Cover Text is: "You have the freedom to copy
and modify this GNU manual.
File: libquadmath.info, Node: Top, Next: Typedef and constants, Up: (dir)
Introduction
************
This manual documents the usage of libquadmath, the GCC Quad-Precision
Math Library Application Programming Interface (API).
* Menu:
* Typedef and constants:: Defined data types and constants
* Math Library Routines:: The Libquadmath math runtime application
programming interface.
* I/O Library Routines:: The Libquadmath I/O runtime application
programming interface.
* GNU Free Documentation License::
How you can copy and share this manual.
* Reporting Bugs:: How to report bugs in GCC Libquadmath.
File: libquadmath.info, Node: Typedef and constants, Next: Math Library Routines, Prev: Top, Up: Top
1 Typedef and constants
***********************
The following data type has been defined via `typedef'.
`__complex128': `__float128'-based complex number
The following macros are defined, which give the numeric limits of
the `__float128' data type.
`FLT128_MAX': largest finite number
`FLT128_MIN': smallest positive number with full precision
`FLT128_EPSILON': difference between 1 and the next larger
representable number
`FLT128_DENORM_MIN': smallest positive denormalized number
`FLT128_MANT_DIG': number of digits in the mantissa (bit precision)
`FLT128_MIN_EXP': maximal negative exponent
`FLT128_MAX_EXP': maximal positive exponent
`FLT128_DIG': number of decimal digits in the mantissa
`FLT128_MIN_10_EXP': maximal negative decimal exponent
`FLT128_MAX_10_EXP': maximal positive decimal exponent
The following mathematical constants of type `__float128' are
defined.
`M_Eq': the constant e (Euler's number)
`M_LOG2Eq': binary logarithm of 2
`M_LOG10Eq': common, decimal logarithm of 2
`M_LN2q': natural logarithm of 2
`M_LN10q': natural logarithm of 10
`M_PIq': pi
`M_PI_2q': pi divided by two
`M_PI_4q': pi divided by four
`M_1_PIq': one over pi
`M_2_PIq': one over two pi
`M_2_SQRTPIq': two over square root of pi
`M_SQRT2q': square root of 2
`M_SQRT1_2q': one over square root of 2
File: libquadmath.info, Node: Math Library Routines, Next: I/O Library Routines, Prev: Typedef and constants, Up: Top
2 Math Library Routines
***********************
The following mathematical functions are available:
`acosq': arc cosine function
`acoshq': inverse hyperbolic cosine function
`asinq': arc sine function
`asinhq': inverse hyperbolic sine function
`atanq': arc tangent function
`atanhq': inverse hyperbolic tangent function
`atan2q': arc tangent function
`cbrtq': cube root function
`ceilq': ceiling value function
`copysignq': copy sign of a number
`coshq': hyperbolic cosine function
`cosq': cosine function
`erfq': error function
`erfcq': complementary error function
`expq': exponential function
`expm1q': exponential minus 1 function
`fabsq': absolute value function
`fdimq': positive difference function
`finiteq': check finiteness of value
`floorq': floor value function
`fmaq': fused multiply and add
`fmaxq': determine maximum of two values
`fminq': determine minimum of two values
`fmodq': remainder value function
`frexpq': extract mantissa and exponent
`hypotq': Eucledian distance function
`ilogbq': get exponent of the value
`isinfq': check for infinity
`isnanq': check for not a number
`j0q': Bessel function of the first kind, first order
`j1q': Bessel function of the first kind, second order
`jnq': Bessel function of the first kind, N-th order
`ldexpq': load exponent of the value
`lgammaq': logarithmic gamma function
`llrintq': round to nearest integer value
`llroundq': round to nearest integer value away from zero
`logq': natural logarithm function
`log10q': base 10 logarithm function
`log1pq': compute natural logarithm of the value plus one
`log2q': base 2 logarithm function
`lrintq': round to nearest integer value
`lroundq': round to nearest integer value away from zero
`modfq': decompose the floating-point number
`nanq': return quiet NaN
`nearbyintq': round to nearest integer
`nextafterq': next representable floating-point number
`powq': power function
`remainderq': remainder function
`remquoq': remainder and part of quotient
`rintq': round-to-nearest integral value
`roundq': round-to-nearest integral value, return `__float128'
`scalblnq': compute exponent using `FLT_RADIX'
`scalbnq': compute exponent using `FLT_RADIX'
`signbitq': return sign bit
`sincosq': calculate sine and cosine simulataneously
`sinhq': hyperbolic sine function
`sinq': sine function
`sqrtq': square root function
`tanq': tangent function
`tanhq': hyperbolic tangent function
`tgammaq': true gamma function
`truncq': round to integer, towards zero
`y0q': Bessel function of the second kind, first order
`y1q': Bessel function of the second kind, second order
`ynq': Bessel function of the second kind, N-th order
`cabsq' complex absolute value function
`cargq': calculate the argument
`cimagq' imaginary part of complex number
`crealq': real part of complex number
`cacoshq': complex arc hyperbolic cosine function
`cacosq': complex arc cosine function
`casinhq': complex arc hyperbolic sine function
`casinq': complex arc sine function
`catanhq': complex arc hyperbolic tangent function
`catanq': complex arc tangent function
`ccosq' complex cosine function:
`ccoshq': complex hyperbolic cosine function
`cexpq': complex exponential function
`cexpiq': computes the exponential function of "i" times a
real value
`clogq': complex natural logarithm
`clog10q': complex base 10 logarithm
`conjq': complex conjugate function
`cpowq': complex power function
`cprojq': project into Riemann Sphere
`csinq': complex sine function
`csinhq': complex hyperbolic sine function
`csqrtq': complex square root
`ctanq': complex tangent function
`ctanhq': complex hyperbolic tangent function
File: libquadmath.info, Node: I/O Library Routines, Next: GNU Free Documentation License, Prev: Math Library Routines, Up: Top
3 I/O Library Routines
**********************
* Menu:
* `strtoflt128': strtoflt128, Convert from string
* `quadmath_snprintf': quadmath_snprintf, Convert to string
File: libquadmath.info, Node: strtoflt128, Next: quadmath_snprintf, Up: I/O Library Routines
3.1 `strtoflt128' -- Convert from string
========================================
The function `strtoflt128' converts a string into a `__float128' number.
Syntax
`__float128 strtoflt128 (const char *s, char **sp)'
_Arguments_:
S input string
SP the address of the next character in the string
The argument SP contains, if not `NULL', the address of the next
character following the parts of the string, which have been read.
Example
#include <quadmath.h>
int main ()
{
__float128 r;
r = strtoflt128 ("1.2345678", NULL);
return 0;
}
File: libquadmath.info, Node: quadmath_snprintf, Prev: strtoflt128, Up: I/O Library Routines
3.2 `quadmath_snprintf' -- Convert to string
============================================
The function `quadmath_snprintf' converts a `__float128' floating-point
number into a string. It is a specialized alternative to `snprintf',
where the format string is restricted to a single conversion specifier
with `Q' modifier and conversion specifier `e', `E', `f', `F', `g',
`G', `a' or `A', with no extra characters before or after the
conversion specifier. The `%m$' or `*m$' style must not be used in the
format.
Syntax
`int quadmath_snprintf (char *s, size_t size, const char *format,
...)'
_Arguments_:
S output string
SIZE byte size of the string, including tailing NUL
FORMAT conversion specifier string
Note
On some targets when supported by the C library hooks are installed
for `printf' family of functions, so that `printf ("%Qe", 1.2Q);'
etc. works too.
Example
#include <quadmath.h>
#include <stdlib.h>
#include <stdio.h>
int main ()
{
__float128 r;
int prec = 20;
int width = 46;
char buf[128];
r = 2.0q;
r = sqrtq (r);
int n = quadmath_snprintf (buf, sizeof buf, "%+-#*.20Qe", width, r);
if ((size_t) n < sizeof buf)
printf ("%s\n", buf);
/* Prints: +1.41421356237309504880e+00 */
quadmath_snprintf (buf, sizeof buf, "%Qa", r);
if ((size_t) n < sizeof buf)
printf ("%s\n", buf);
/* Prints: 0x1.6a09e667f3bcc908b2fb1366ea96p+0 */
n = quadmath_snprintf (NULL, 0, "%+-#46.*Qe", prec, r);
if (n > -1)
{
char *str = malloc (n + 1);
if (str)
{
quadmath_snprintf (str, n + 1, "%+-#46.*Qe", prec, r);
printf ("%s\n", str);
/* Prints: +1.41421356237309504880e+00 */
}
free (str);
}
return 0;
}
File: libquadmath.info, Node: GNU Free Documentation License, Next: Reporting Bugs, Prev: I/O Library Routines, Up: Top
GNU Free Documentation License
******************************
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ADDENDUM: How to use this License for your documents
====================================================
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File: libquadmath.info, Node: Reporting Bugs, Prev: GNU Free Documentation License, Up: Top
4 Reporting Bugs
****************
Bugs in the GCC Quad-Precision Math Library implementation should be
reported via `http://gcc.gnu.org/bugs.html'.
Tag Table:
Node: Top1696
Node: Typedef and constants2430
Node: Math Library Routines3870
Node: I/O Library Routines7675
Node: strtoflt1288000
Node: quadmath_snprintf8758
Node: GNU Free Documentation License10966
Node: Reporting Bugs36132
End Tag Table