|
|
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This header is part of thefloating-point environment library.
Contents |
Defined in header <fenv.h> | |
| fenv_t | The type representing the entire floating-point environment |
| fexcept_t | The type representing all floating-point status flags collectively |
(C99) | clears the specified floating-point status flags (function)[edit] |
(C99) | determines which of the specified floating-point status flags are set (function)[edit] |
(C99) | raises the specified floating-point exceptions (function)[edit] |
(C99)(C99) | copies the state of the specified floating-point status flags from or to the floating-point environment (function)[edit] |
(C99)(C99) | gets or sets rounding direction (function)[edit] |
(C99) | saves or restores the current floating-point environment (function)[edit] |
(C99) | saves the environment, clears all status flags and ignores all future errors (function)[edit] |
(C99) | restores the floating-point environment and raises the previously raise exceptions (function)[edit] |
| floating-point exceptions (macro constant)[edit] | |
| floating-point rounding direction (macro constant)[edit] | |
(C99) | default floating-point environment (macro constant)[edit] |
#define __STDC_VERSION_FENV_H__ 202311L #define FE_ALL_EXCEPT /* see description */#define FE_DIVBYZERO /* see description */#define FE_INEXACT /* see description */#define FE_INVALID /* see description */#define FE_OVERFLOW /* see description */#define FE_UNDERFLOW /* see description */#define FE_DOWNWARD /* see description */#define FE_TONEARESTFROMZERO /* see description */#define FE_TONEAREST /* see description */#define FE_TOWARDZERO /* see description */#define FE_UPWARD /* see description */#define FE_DFL_ENV /* see description */#define FE_DFL_MODE /* see description */ #define fenv_t /* see description */#define fexcept_t /* see description */#define femode_t /* see description */ #pragma STDC FENV_ACCESS /*on-off-switch*/#pragma STDC FENV_ROUND direction#pragma STDC FENV_ROUND FE_DYNAMIC // functionsintfeclearexcept(int excepts);intfegetexceptflag(fexcept_t* flagp,int excepts);intferaiseexcept(int excepts);int fesetexcept(int excepts);intfesetexceptflag(const fexcept_t* flagp,int excepts);int fetestexceptflag(const fexcept_t* flagp,int excepts);intfetestexcept(int excepts);int fegetmode(femode_t* modep);intfegetround(void);int fesetmode(const femode_t* modep);intfesetround(int rnd);intfegetenv(fenv_t* envp);intfeholdexcept(fenv_t* envp);intfesetenv(const fenv_t* envp);intfeupdateenv(const fenv_t* envp); // Only if the implementation defines __STDC_IEC_60559_DFP__:#define FE_DEC_DOWNWARD /* implementation-defined */#define FE_DEC_TONEARESTFROMZERO /* implementation-defined */#define FE_DEC_TONEAREST /* implementation-defined */#define FE_DEC_TOWARDZERO /* implementation-defined */#define FE_DEC_UPWARD /* implementation-defined */ #pragma STDC FENV_DEC_ROUND /*dec-direction*/int fe_dec_getround(void);int fe_dec_setround(int rnd); // Only if the implementation follows the recommended practice from F.2.2:#define FE_SNANS_ALWAYS_SIGNAL /* implementation-defined */
