This is libquadmath.info, produced by makeinfo version 4.13 from /space/rguenther/gcc-7.2.0/gcc-7.2.0/libquadmath/libquadmath.texi. Copyright (C) 2010-2017 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. 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) 2010-2017 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 `logbq': get exponent of the value `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 simultaneously `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 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 #include #include 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 ****************************** Version 1.3, 3 November 2008 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. `http://fsf.org/' Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 0. 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Tag Table: Node: Top1684 Node: Typedef and constants2418 Node: Math Library Routines3858 Node: I/O Library Routines7698 Node: strtoflt1288023 Node: quadmath_snprintf8781 Node: GNU Free Documentation License10989 Node: Reporting Bugs36155  End Tag Table