[原创]谁能解释下 - C语言论坛

楼主

问题点数：0 回复次数：0

[原创]谁能解释下

/* math.h

Definitions for the math floating point package.

#ifndef _MATH_H #define _MATH_H 1

#define EDOM 33 /* Math argument */ #define ERANGE 34 /* Result too large */

#define HUGE_VAL _huge_dble extern double _Cdecl _huge_dble;

int _Cdecl abs (int x); double _Cdecl acos (double x); double _Cdecl asin (double x); double _Cdecl atan (double x); double _Cdecl atan2 (double y, double x); double _Cdecl atof (const char *s); double _Cdecl ceil (double x); double _Cdecl cos (double x); double _Cdecl cosh (double x); double _Cdecl exp (double x); double _Cdecl fabs (double x); double _Cdecl floor (double x); double _Cdecl fmod (double x, double y); double _Cdecl frexp (double x, int *exponent); long _Cdecl labs (long x); double _Cdecl ldexp (double x, int exponent); double _Cdecl log (double x); double _Cdecl log10 (double x); double _Cdecl modf (double x, double *ipart); double _Cdecl pow (double x, double y); double _Cdecl sin (double x); double _Cdecl sinh (double x); double _Cdecl sqrt (double x); double _Cdecl tan (double x); double _Cdecl tanh (double x);

struct exception { int type; char *name; double arg1, arg2, retval; };

int _Cdecl matherr (struct exception *e);

#if !__STDC__ double cdecl hypot (double x, double y); double cdecl poly (double x, int degree, double coeffs []); double cdecl pow10 (int p);

struct complex /* as used by "cabs" function */ { double x, y; };

#define cabs(z) (hypot ((z).x, (z).y))

/* The customary matherr() exception handler for maths functions is not compatible with the x3j11 draft standard for C. _matherr() is provided as a compromise. */

typedef enum { DOMAIN = 1, /* argument domain error -- log (-1) */ SING, /* argument singularity -- pow (0,-2)) */ OVERFLOW, /* overflow range error -- exp (1000) */ UNDERFLOW, /* underflow range error -- exp (-1000) */ TLOSS, /* total loss of significance -- sin(10e70) */ PLOSS, /* partial loss of signif. -- not used */ } _mexcep;

double _Cdecl _matherr (_mexcep why, char *fun, double *arg1p, double *arg2p, double retval);

/* Constants rounded for 21 decimals. */ #define M_E 2.71828182845904523536 #define M_LOG2E 1.44269504088896340736 #define M_LOG10E 0.434294481903251827651 #define M_LN2 0.693147180559945309417 #define M_LN10 2.30258509299404568402 #define M_PI 3.14159265358979323846 #define M_PI_2 1.57079632679489661923 #define M_PI_4 0.785398163397448309116 #define M_1_PI 0.318309886183790671538 #define M_2_PI 0.636619772367581343076 #define M_1_SQRTPI 0.564189583547756286948 #define M_2_SQRTPI 1.12837916709551257390 #define M_SQRT2 1.41421356237309504880 #define M_SQRT_2 0.707106781186547524401

#endif /* __STDC__ */

#endif 谁能解释下~~~~~~看到我都晕了

搜索更多相关主题的帖子: 解释　