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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/header/../../c/header/fenv.html below:

Standard library header <fenv.h>Â (C99)

This header is part of the floating-point environment library.

#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
 
// functions
int feclearexcept(int excepts);
int fegetexceptflag(fexcept_t* flagp, int excepts);
int feraiseexcept(int excepts);
int fesetexcept(int excepts);
int fesetexceptflag(const fexcept_t* flagp, int excepts);
int fetestexceptflag(const fexcept_t* flagp, int excepts);
int fetestexcept(int excepts);
int fegetmode(femode_t* modep);
int fegetround(void);
int fesetmode(const femode_t* modep);
int fesetround(int rnd);
int fegetenv(fenv_t* envp);
int feholdexcept(fenv_t* envp);
int fesetenv(const fenv_t* envp);
int feupdateenv(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 */

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