1 /* Copyright (C) 1991, 1992, 1993, 1995 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 * ANSI Standard: 4.5 MATHEMATICS <math.h>
33 /* Get machine-dependent HUGE_VAL value (returned on overflow). */
36 /* Get machine-dependent NAN value (returned for some domain errors). */
42 /* Trigonometric functions. */
44 /* Arc cosine of X. */
45 extern double acos __P ((double __x)) __attribute__ ((__const__));
47 extern double asin __P ((double __x)) __attribute__ ((__const__));
48 /* Arc tangent of X. */
49 extern double atan __P ((double __x)) __attribute__ ((__const__));
50 /* Arc tangent of Y/X. */
51 extern double atan2 __P ((double __y, double __x)) __attribute__ ((__const__));
54 extern double cos __P ((double __x)) __attribute__ ((__const__));
56 extern double sin __P ((double __x)) __attribute__ ((__const__));
58 extern double tan __P ((double __x)) __attribute__ ((__const__));
61 /* Hyperbolic functions. */
63 /* Hyperbolic cosine of X. */
64 extern double cosh __P ((double __x)) __attribute__ ((__const__));
65 /* Hyperbolic sine of X. */
66 extern double sinh __P ((double __x)) __attribute__ ((__const__));
67 /* Hyperbolic tangent of X. */
68 extern double tanh __P ((double __x)) __attribute__ ((__const__));
71 /* Hyperbolic arc cosine of X. */
72 extern double acosh __P ((double __x)) __attribute__ ((__const__));
73 /* Hyperbolic arc sine of X. */
74 extern double asinh __P ((double __x)) __attribute__ ((__const__));
75 /* Hyperbolic arc tangent of X. */
76 extern double atanh __P ((double __x)) __attribute__ ((__const__));
79 /* Exponential and logarithmic functions. */
81 /* Exponentional function of X. */
82 extern double exp __P ((double __x)) __attribute__ ((__const__));
84 /* Break VALUE into a normalized fraction and an integral power of 2. */
85 extern double frexp __P ((double __value, int *__exp));
87 /* X times (two to the EXP power). */
88 extern double ldexp __P ((double __x, int __exp)) __attribute__ ((__const__));
90 /* Natural logarithm of X. */
91 extern double log __P ((double __x)) __attribute__ ((__const__));
93 /* Base-ten logarithm of X. */
94 extern double log10 __P ((double __x)) __attribute__ ((__const__));
97 /* Return exp(X) - 1. */
98 extern double __expm1 __P ((double __x)) __attribute__ ((__const__));
99 extern double expm1 __P ((double __x)) __attribute__ ((__const__));
101 /* Return log(1 + X). */
102 extern double log1p __P ((double __x)) __attribute__ ((__const__));
105 /* Break VALUE into integral and fractional parts. */
106 extern double modf __P ((double __value, double *__iptr));
109 /* Power functions. */
111 /* Return X to the Y power. */
112 extern double pow __P ((double __x, double __y)) __attribute__ ((__const__));
114 /* Return the square root of X. */
115 extern double sqrt __P ((double __x)) __attribute__ ((__const__));
118 /* Return the cube root of X. */
119 extern double cbrt __P ((double __x)) __attribute__ ((__const__));
123 /* Nearest integer, absolute value, and remainder functions. */
125 /* Smallest integral value not less than X. */
126 extern double ceil __P ((double __x)) __attribute__ ((__const__));
128 /* Absolute value of X. */
129 extern double fabs __P ((double __x)) __attribute__ ((__const__));
131 /* Largest integer not greater than X. */
132 extern double floor __P ((double __x)) __attribute__ ((__const__));
134 /* Floating-point modulo remainder of X/Y. */
135 extern double fmod __P ((double __x, double __y)) __attribute__ ((__const__));
138 /* Return 0 if VALUE is finite or NaN, +1 if it
139 is +Infinity, -1 if it is -Infinity. */
140 extern int __isinf __P ((double __value)) __attribute__ ((__const__));
142 /* Return nonzero if VALUE is not a number. */
143 extern int __isnan __P ((double __value)) __attribute__ ((__const__));
145 /* Return nonzero if VALUE is finite and not NaN. */
146 extern int __finite __P ((double __value)) __attribute__ ((__const__));
148 #define __finite(value) (!__isinf(value))
151 /* Deal with an infinite or NaN result.
152 If ERROR is ERANGE, result is +Inf;
153 if ERROR is - ERANGE, result is -Inf;
154 otherwise result is NaN.
155 This will set `errno' to either ERANGE or EDOM,
156 and may return an infinity or NaN, or may do something else. */
157 extern double __infnan __P ((int __error));
159 /* Return X with its signed changed to Y's. */
160 extern double __copysign __P ((double __x, double __y))
161 __attribute__ ((__const__));
163 /* Return X times (2 to the Nth power). */
164 extern double __scalb __P ((double __x, int __n))
165 __attribute__ ((__const__));
168 #define __scalb(x, n) ldexp ((x), (n))
171 /* Return the remainder of X/Y. */
172 extern double __drem __P ((double __x, double __y))
173 __attribute__ ((__const__));
175 /* Return the base 2 signed integral exponent of X. */
176 extern double __logb __P ((double __x)) __attribute__ ((__const__));
180 /* Return the integer nearest X in the direction of the
181 prevailing rounding mode. */
182 extern double __rint __P ((double __x)) __attribute__ ((__const__));
183 extern double rint __P ((double __x)) __attribute__ ((__const__));
185 /* Return `sqrt(X*X + Y*Y)'. */
186 extern double hypot __P ((double __x, double __y)) __attribute__ ((__const__));
188 struct __cabs_complex
193 /* Return `sqrt(X*X + Y*Y)'. */
194 extern double cabs __P ((struct __cabs_complex)) __attribute__ ((__const__));
196 extern int isinf __P ((double __value)) __attribute__ ((__const__));
197 extern int isnan __P ((double __value)) __attribute__ ((__const__));
198 extern int finite __P ((double __value)) __attribute__ ((__const__));
199 extern double infnan __P ((int __error)) __attribute__ ((__const__));
200 extern double copysign __P ((double __x, double __y))
201 __attribute__ ((__const__));
202 extern double scalb __P ((double __x, int __n)) __attribute__ ((__const__));
203 extern double drem __P ((double __x, double __y)) __attribute__ ((__const__));
204 extern double logb __P ((double __x)) __attribute__ ((__const__));
207 #define isinf(value) __isinf(value)
208 #define isnan(value) __isnan(value)
209 #define infnan(error) __infnan(error)
210 #define finite(value) __finite(value)
211 #define copysign(x, y) __copysign((x), (y))
212 #define scalb(x, n) __scalb((x), (n))
213 #define drem(x, y) __drem((x), (y))
214 #define logb(x) __logb(x)
215 #endif /* Optimizing. */
217 #endif /* Use misc. */
221 /* The "Future Library Directions" section of the
222 ANSI Standard reserves these as `float' and
223 `long double' versions of the above functions. */
225 extern float acosf __P ((float __x)) __attribute__ ((__const__));
226 extern float asinf __P ((float __x)) __attribute__ ((__const__));
227 extern float atanf __P ((float __x)) __attribute__ ((__const__));
228 extern float atan2f __P ((float __y, float __x)) __attribute__ ((__const__));
229 extern float cosf __P ((float __x)) __attribute__ ((__const__));
230 extern float sinf __P ((float __x)) __attribute__ ((__const__));
231 extern float tanf __P ((float __x)) __attribute__ ((__const__));
232 extern float coshf __P ((float __x)) __attribute__ ((__const__));
233 extern float sinhf __P ((float __x)) __attribute__ ((__const__));
234 extern float tanhf __P ((float __x)) __attribute__ ((__const__));
235 extern float expf __P ((float __x)) __attribute__ ((__const__));
236 extern float frexpf __P ((float __value, int *__exp));
237 extern float ldexpf __P ((float __x, int __exp)) __attribute__ ((__const__));
238 extern float logf __P ((float __x)) __attribute__ ((__const__));
239 extern float log10f __P ((float __x)) __attribute__ ((__const__));
240 extern float modff __P ((float __value, float *__iptr));
241 extern float powf __P ((float __x, float __y)) __attribute__ ((__const__));
242 extern float sqrtf __P ((float __x)) __attribute__ ((__const__));
243 extern float ceilf __P ((float __x)) __attribute__ ((__const__));
244 extern float fabsf __P ((float __x)) __attribute__ ((__const__));
245 extern float floorf __P ((float __x)) __attribute__ ((__const__));
246 extern float fmodf __P ((float __x, float __y)) __attribute__ ((__const__));
248 extern __long_double_t acosl __P ((__long_double_t __x))
249 __attribute__ ((__const__));
250 extern __long_double_t asinl __P ((__long_double_t __x))
251 __attribute__ ((__const__));
252 extern __long_double_t atanl __P ((__long_double_t __x))
253 __attribute__ ((__const__));
254 extern __long_double_t atan2l __P ((__long_double_t __y, __long_double_t __x))
255 __attribute__ ((__const__));
256 extern __long_double_t cosl __P ((__long_double_t __x))
257 __attribute__ ((__const__));
258 extern __long_double_t sinl __P ((__long_double_t __x))
259 __attribute__ ((__const__));
260 extern __long_double_t tanl __P ((__long_double_t __x))
261 __attribute__ ((__const__));
262 extern __long_double_t coshl __P ((__long_double_t __x))
263 __attribute__ ((__const__));
264 extern __long_double_t sinhl __P ((__long_double_t __x))
265 __attribute__ ((__const__));
266 extern __long_double_t tanhl __P ((__long_double_t __x))
267 __attribute__ ((__const__));
268 extern __long_double_t expl __P ((__long_double_t __x))
269 __attribute__ ((__const__));
270 extern __long_double_t frexpl __P ((__long_double_t __value, int *__exp));
271 extern __long_double_t ldexpl __P ((__long_double_t __x, int __exp))
272 __attribute__ ((__const__));
273 extern __long_double_t logl __P ((__long_double_t __x))
274 __attribute__ ((__const__));
275 extern __long_double_t log10l __P ((__long_double_t __x))
276 __attribute__ ((__const__));
277 extern __long_double_t modfl __P ((__long_double_t __value,
278 __long_double_t *__ip));
279 extern __long_double_t powl __P ((__long_double_t __x, __long_double_t __y))
280 __attribute__ ((__const__));
281 extern __long_double_t sqrtl __P ((__long_double_t __x))
282 __attribute__ ((__const__));
283 extern __long_double_t ceill __P ((__long_double_t __x))
284 __attribute__ ((__const__));
285 extern __long_double_t fabsl __P ((__long_double_t __x))
286 __attribute__ ((__const__));
287 extern __long_double_t floorl __P ((__long_double_t __x))
288 __attribute__ ((__const__));
289 extern __long_double_t fmodl __P ((__long_double_t __x, __long_double_t __y))
290 __attribute__ ((__const__));
293 /* Get machine-dependent inline versions (if there are any). */
300 /* Some useful constants. */
301 #define M_E 2.7182818284590452354 /* e */
302 #define M_LOG2E 1.4426950408889634074 /* log 2e */
303 #define M_LOG10E 0.43429448190325182765 /* log 10e */
304 #define M_LN2 0.69314718055994530942 /* log e2 */
305 #define M_LN10 2.30258509299404568402 /* log e10 */
306 #define M_PI 3.14159265358979323846 /* pi */
307 #define M_PI_2 1.57079632679489661923 /* pi/2 */
308 #define M_PI_4 0.78539816339744830962 /* pi/4 */
309 #define M_1_PI 0.31830988618379067154 /* 1/pi */
310 #define M_2_PI 0.63661977236758134308 /* 2/pi */
311 #define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi) */
312 #define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
313 #define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */