1This is libquadmath.info, produced by makeinfo version 5.2 from
2libquadmath.texi.
3
4Copyright (C) 2010-2013 Free Software Foundation, Inc.
5
6     Permission is granted to copy, distribute and/or modify this
7     document under the terms of the GNU Free Documentation License,
8     Version 1.2 or any later version published by the Free Software
9     Foundation; with no Invariant Sections, with the Front-Cover Texts
10     being "A GNU Manual," and with the Back-Cover Texts as in (a)
11     below.  A copy of the license is included in the section entitled
12     "GNU Free Documentation License."
13
14     (a) The FSF's Back-Cover Text is: "You have the freedom to copy and
15     modify this GNU manual.
16INFO-DIR-SECTION GNU Libraries
17START-INFO-DIR-ENTRY
18* libquadmath: (libquadmath).                  GCC Quad-Precision Math Library
19END-INFO-DIR-ENTRY
20
21   This manual documents the GCC Quad-Precision Math Library API.
22
23   Published by the Free Software Foundation 51 Franklin Street, Fifth
24Floor Boston, MA 02110-1301 USA
25
26   Copyright (C) 2010-2013 Free Software Foundation, Inc.
27
28     Permission is granted to copy, distribute and/or modify this
29     document under the terms of the GNU Free Documentation License,
30     Version 1.2 or any later version published by the Free Software
31     Foundation; with no Invariant Sections, with the Front-Cover Texts
32     being "A GNU Manual," and with the Back-Cover Texts as in (a)
33     below.  A copy of the license is included in the section entitled
34     "GNU Free Documentation License."
35
36     (a) The FSF's Back-Cover Text is: "You have the freedom to copy and
37     modify this GNU manual.
38
39
40File: libquadmath.info,  Node: Top,  Next: Typedef and constants,  Up: (dir)
41
42Introduction
43************
44
45This manual documents the usage of libquadmath, the GCC Quad-Precision
46Math Library Application Programming Interface (API).
47
48* Menu:
49
50* Typedef and constants::      Defined data types and constants
51* Math Library Routines::      The Libquadmath math runtime application
52                               programming interface.
53* I/O Library Routines::       The Libquadmath I/O runtime application
54                               programming interface.
55* GNU Free Documentation License::
56                               How you can copy and share this manual.
57* Reporting Bugs::             How to report bugs in GCC Libquadmath.
58
59
60File: libquadmath.info,  Node: Typedef and constants,  Next: Math Library Routines,  Prev: Top,  Up: Top
61
621 Typedef and constants
63***********************
64
65The following data type has been defined via 'typedef'.
66
67'__complex128': '__float128'-based complex number
68
69   The following macros are defined, which give the numeric limits of
70the '__float128' data type.
71
72'FLT128_MAX': largest finite number
73'FLT128_MIN': smallest positive number with full precision
74'FLT128_EPSILON': difference between 1 and the next larger
75     representable number
76'FLT128_DENORM_MIN': smallest positive denormalized number
77'FLT128_MANT_DIG': number of digits in the mantissa (bit precision)
78'FLT128_MIN_EXP': maximal negative exponent
79'FLT128_MAX_EXP': maximal positive exponent
80'FLT128_DIG': number of decimal digits in the mantissa
81'FLT128_MIN_10_EXP': maximal negative decimal exponent
82'FLT128_MAX_10_EXP': maximal positive decimal exponent
83
84   The following mathematical constants of type '__float128' are
85defined.
86
87'M_Eq': the constant e (Euler's number)
88'M_LOG2Eq': binary logarithm of 2
89'M_LOG10Eq': common, decimal logarithm of 2
90'M_LN2q': natural logarithm of 2
91'M_LN10q': natural logarithm of 10
92'M_PIq': pi
93'M_PI_2q': pi divided by two
94'M_PI_4q': pi divided by four
95'M_1_PIq': one over pi
96'M_2_PIq': one over two pi
97'M_2_SQRTPIq': two over square root of pi
98'M_SQRT2q': square root of 2
99'M_SQRT1_2q': one over square root of 2
100
101
102File: libquadmath.info,  Node: Math Library Routines,  Next: I/O Library Routines,  Prev: Typedef and constants,  Up: Top
103
1042 Math Library Routines
105***********************
106
107The following mathematical functions are available:
108
109'acosq': arc cosine function
110'acoshq': inverse hyperbolic cosine function
111'asinq': arc sine function
112'asinhq': inverse hyperbolic sine function
113'atanq': arc tangent function
114'atanhq': inverse hyperbolic tangent function
115'atan2q': arc tangent function
116'cbrtq': cube root function
117'ceilq': ceiling value function
118'copysignq': copy sign of a number
119'coshq': hyperbolic cosine function
120'cosq': cosine function
121'erfq': error function
122'erfcq': complementary error function
123'expq': exponential function
124'expm1q': exponential minus 1 function
125'fabsq': absolute value function
126'fdimq': positive difference function
127'finiteq': check finiteness of value
128'floorq': floor value function
129'fmaq': fused multiply and add
130'fmaxq': determine maximum of two values
131'fminq': determine minimum of two values
132'fmodq': remainder value function
133'frexpq': extract mantissa and exponent
134'hypotq': Eucledian distance function
135'ilogbq': get exponent of the value
136'isinfq': check for infinity
137'isnanq': check for not a number
138'j0q': Bessel function of the first kind, first order
139'j1q': Bessel function of the first kind, second order
140'jnq': Bessel function of the first kind, N-th order
141'ldexpq': load exponent of the value
142'lgammaq': logarithmic gamma function
143'llrintq': round to nearest integer value
144'llroundq': round to nearest integer value away from zero
145'logq': natural logarithm function
146'log10q': base 10 logarithm function
147'log1pq': compute natural logarithm of the value plus one
148'log2q': base 2 logarithm function
149'lrintq': round to nearest integer value
150'lroundq': round to nearest integer value away from zero
151'modfq': decompose the floating-point number
152'nanq': return quiet NaN
153'nearbyintq': round to nearest integer
154'nextafterq': next representable floating-point number
155'powq': power function
156'remainderq': remainder function
157'remquoq': remainder and part of quotient
158'rintq': round-to-nearest integral value
159'roundq': round-to-nearest integral value, return '__float128'
160'scalblnq': compute exponent using 'FLT_RADIX'
161'scalbnq': compute exponent using 'FLT_RADIX'
162'signbitq': return sign bit
163'sincosq': calculate sine and cosine simulataneously
164'sinhq': hyperbolic sine function
165'sinq': sine function
166'sqrtq': square root function
167'tanq': tangent function
168'tanhq': hyperbolic tangent function
169'tgammaq': true gamma function
170'truncq': round to integer, towards zero
171'y0q': Bessel function of the second kind, first order
172'y1q': Bessel function of the second kind, second order
173'ynq': Bessel function of the second kind, N-th order
174'cabsq' complex absolute value function
175'cargq': calculate the argument
176'cimagq' imaginary part of complex number
177'crealq': real part of complex number
178'cacoshq': complex arc hyperbolic cosine function
179'cacosq': complex arc cosine function
180'casinhq': complex arc hyperbolic sine function
181'casinq': complex arc sine function
182'catanhq': complex arc hyperbolic tangent function
183'catanq': complex arc tangent function
184'ccosq' complex cosine function:
185'ccoshq': complex hyperbolic cosine function
186'cexpq': complex exponential function
187'cexpiq': computes the exponential function of "i" times a
188     real value
189'clogq': complex natural logarithm
190'clog10q': complex base 10 logarithm
191'conjq': complex conjugate function
192'cpowq': complex power function
193'cprojq': project into Riemann Sphere
194'csinq': complex sine function
195'csinhq': complex hyperbolic sine function
196'csqrtq': complex square root
197'ctanq': complex tangent function
198'ctanhq': complex hyperbolic tangent function
199
200
201File: libquadmath.info,  Node: I/O Library Routines,  Next: GNU Free Documentation License,  Prev: Math Library Routines,  Up: Top
202
2033 I/O Library Routines
204**********************
205
206* Menu:
207
208* 'strtoflt128':          strtoflt128,          Convert from string
209* 'quadmath_snprintf':    quadmath_snprintf,    Convert to string
210
211
212File: libquadmath.info,  Node: strtoflt128,  Next: quadmath_snprintf,  Up: I/O Library Routines
213
2143.1 'strtoflt128' -- Convert from string
215========================================
216
217The function 'strtoflt128' converts a string into a '__float128' number.
218
219Syntax
220     '__float128 strtoflt128 (const char *s, char **sp)'
221
222_Arguments_:
223     S           input string
224     SP          the address of the next character in the string
225
226     The argument SP contains, if not 'NULL', the address of the next
227     character following the parts of the string, which have been read.
228
229Example
230          #include <quadmath.h>
231
232          int main ()
233          {
234            __float128 r;
235
236            r = strtoflt128 ("1.2345678", NULL);
237
238            return 0;
239          }
240
241
242File: libquadmath.info,  Node: quadmath_snprintf,  Prev: strtoflt128,  Up: I/O Library Routines
243
2443.2 'quadmath_snprintf' -- Convert to string
245============================================
246
247The function 'quadmath_snprintf' converts a '__float128' floating-point
248number into a string.  It is a specialized alternative to 'snprintf',
249where the format string is restricted to a single conversion specifier
250with 'Q' modifier and conversion specifier 'e', 'E', 'f', 'F', 'g', 'G',
251'a' or 'A', with no extra characters before or after the conversion
252specifier.  The '%m$' or '*m$' style must not be used in the format.
253
254Syntax
255     'int quadmath_snprintf (char *s, size_t size, const char *format,
256     ...)'
257
258_Arguments_:
259     S           output string
260     SIZE        byte size of the string, including tailing NUL
261     FORMAT      conversion specifier string
262
263Note
264     On some targets when supported by the C library hooks are installed
265     for 'printf' family of functions, so that 'printf ("%Qe", 1.2Q);'
266     etc. works too.
267
268Example
269          #include <quadmath.h>
270          #include <stdlib.h>
271          #include <stdio.h>
272
273          int main ()
274          {
275            __float128 r;
276            int prec = 20;
277            int width = 46;
278            char buf[128];
279
280            r = 2.0q;
281            r = sqrtq (r);
282            int n = quadmath_snprintf (buf, sizeof buf, "%+-#*.20Qe", width, r);
283            if ((size_t) n < sizeof buf)
284              printf ("%s\n", buf);
285              /* Prints: +1.41421356237309504880e+00 */
286            quadmath_snprintf (buf, sizeof buf, "%Qa", r);
287            if ((size_t) n < sizeof buf)
288              printf ("%s\n", buf);
289              /* Prints: 0x1.6a09e667f3bcc908b2fb1366ea96p+0 */
290            n = quadmath_snprintf (NULL, 0, "%+-#46.*Qe", prec, r);
291            if (n > -1)
292              {
293                char *str = malloc (n + 1);
294                if (str)
295                  {
296                    quadmath_snprintf (str, n + 1, "%+-#46.*Qe", prec, r);
297                    printf ("%s\n", str);
298                    /* Prints: +1.41421356237309504880e+00 */
299                  }
300                free (str);
301              }
302            return 0;
303          }
304
305
306File: libquadmath.info,  Node: GNU Free Documentation License,  Next: Reporting Bugs,  Prev: I/O Library Routines,  Up: Top
307
308GNU Free Documentation License
309******************************
310
311                     Version 1.3, 3 November 2008
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631
632     You may extract a single document from such a collection, and
633     distribute it individually under this License, provided you insert
634     a copy of this License into the extracted document, and follow this
635     License in all other respects regarding verbatim copying of that
636     document.
637
638  7. AGGREGATION WITH INDEPENDENT WORKS
639
640     A compilation of the Document or its derivatives with other
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642     storage or distribution medium, is called an "aggregate" if the
643     copyright resulting from the compilation is not used to limit the
644     legal rights of the compilation's users beyond what the individual
645     works permit.  When the Document is included in an aggregate, this
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647     are not themselves derivative works of the Document.
648
649     If the Cover Text requirement of section 3 is applicable to these
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651     of the entire aggregate, the Document's Cover Texts may be placed
652     on covers that bracket the Document within the aggregate, or the
653     electronic equivalent of covers if the Document is in electronic
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655     the whole aggregate.
656
657  8. TRANSLATION
658
659     Translation is considered a kind of modification, so you may
660     distribute translations of the Document under the terms of section
661     4.  Replacing Invariant Sections with translations requires special
662     permission from their copyright holders, but you may include
663     translations of some or all Invariant Sections in addition to the
664     original versions of these Invariant Sections.  You may include a
665     translation of this License, and all the license notices in the
666     Document, and any Warranty Disclaimers, provided that you also
667     include the original English version of this License and the
668     original versions of those notices and disclaimers.  In case of a
669     disagreement between the translation and the original version of
670     this License or a notice or disclaimer, the original version will
671     prevail.
672
673     If a section in the Document is Entitled "Acknowledgements",
674     "Dedications", or "History", the requirement (section 4) to
675     Preserve its Title (section 1) will typically require changing the
676     actual title.
677
678  9. TERMINATION
679
680     You may not copy, modify, sublicense, or distribute the Document
681     except as expressly provided under this License.  Any attempt
682     otherwise to copy, modify, sublicense, or distribute it is void,
683     and will automatically terminate your rights under this License.
684
685     However, if you cease all violation of this License, then your
686     license from a particular copyright holder is reinstated (a)
687     provisionally, unless and until the copyright holder explicitly and
688     finally terminates your license, and (b) permanently, if the
689     copyright holder fails to notify you of the violation by some
690     reasonable means prior to 60 days after the cessation.
691
692     Moreover, your license from a particular copyright holder is
693     reinstated permanently if the copyright holder notifies you of the
694     violation by some reasonable means, this is the first time you have
695     received notice of violation of this License (for any work) from
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697     after your receipt of the notice.
698
699     Termination of your rights under this section does not terminate
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701     under this License.  If your rights have been terminated and not
702     permanently reinstated, receipt of a copy of some or all of the
703     same material does not give you any rights to use it.
704
705  10. FUTURE REVISIONS OF THIS LICENSE
706
707     The Free Software Foundation may publish new, revised versions of
708     the GNU Free Documentation License from time to time.  Such new
709     versions will be similar in spirit to the present version, but may
710     differ in detail to address new problems or concerns.  See
711     <http://www.gnu.org/copyleft/>.
712
713     Each version of the License is given a distinguishing version
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719     Document does not specify a version number of this License, you may
720     choose any version ever published (not as a draft) by the Free
721     Software Foundation.  If the Document specifies that a proxy can
722     decide which future versions of this License can be used, that
723     proxy's public statement of acceptance of a version permanently
724     authorizes you to choose that version for the Document.
725
726  11. RELICENSING
727
728     "Massive Multiauthor Collaboration Site" (or "MMC Site") means any
729     World Wide Web server that publishes copyrightable works and also
730     provides prominent facilities for anybody to edit those works.  A
731     public wiki that anybody can edit is an example of such a server.
732     A "Massive Multiauthor Collaboration" (or "MMC") contained in the
733     site means any set of copyrightable works thus published on the MMC
734     site.
735
736     "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
737     license published by Creative Commons Corporation, a not-for-profit
738     corporation with a principal place of business in San Francisco,
739     California, as well as future copyleft versions of that license
740     published by that same organization.
741
742     "Incorporate" means to publish or republish a Document, in whole or
743     in part, as part of another Document.
744
745     An MMC is "eligible for relicensing" if it is licensed under this
746     License, and if all works that were first published under this
747     License somewhere other than this MMC, and subsequently
748     incorporated in whole or in part into the MMC, (1) had no cover
749     texts or invariant sections, and (2) were thus incorporated prior
750     to November 1, 2008.
751
752     The operator of an MMC Site may republish an MMC contained in the
753     site under CC-BY-SA on the same site at any time before August 1,
754     2009, provided the MMC is eligible for relicensing.
755
756ADDENDUM: How to use this License for your documents
757====================================================
758
759To use this License in a document you have written, include a copy of
760the License in the document and put the following copyright and license
761notices just after the title page:
762
763       Copyright (C)  YEAR  YOUR NAME.
764       Permission is granted to copy, distribute and/or modify this document
765       under the terms of the GNU Free Documentation License, Version 1.3
766       or any later version published by the Free Software Foundation;
767       with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
768       Texts.  A copy of the license is included in the section entitled ``GNU
769       Free Documentation License''.
770
771   If you have Invariant Sections, Front-Cover Texts and Back-Cover
772Texts, replace the "with...Texts."  line with this:
773
774         with the Invariant Sections being LIST THEIR TITLES, with
775         the Front-Cover Texts being LIST, and with the Back-Cover Texts
776         being LIST.
777
778   If you have Invariant Sections without Cover Texts, or some other
779combination of the three, merge those two alternatives to suit the
780situation.
781
782   If your document contains nontrivial examples of program code, we
783recommend releasing these examples in parallel under your choice of free
784software license, such as the GNU General Public License, to permit
785their use in free software.
786
787
788File: libquadmath.info,  Node: Reporting Bugs,  Prev: GNU Free Documentation License,  Up: Top
789
7904 Reporting Bugs
791****************
792
793Bugs in the GCC Quad-Precision Math Library implementation should be
794reported via <http://gcc.gnu.org/bugs.html>.
795
796
797
798Tag Table:
799Node: Top1633
800Node: Typedef and constants2367
801Node: Math Library Routines3786
802Node: I/O Library Routines7503
803Node: strtoflt1287828
804Node: quadmath_snprintf8588
805Node: GNU Free Documentation License10798
806Node: Reporting Bugs35945
807
808End Tag Table
809