FE_DIVBYZERO, FE_INEXACT, FE_INVALID, FE_OVERFLOW, FE_UNDERFLOW, FE_ALL_EXCEPT

 

C

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Floating point environment

Functions

feclearexcept (C99)

fetestexcept (C99)

feraiseexcept (C99)

fegetexceptflag fesetexceptflag (C99) (C99)

fegetround fesetround (C99) (C99)

fegetenv fesetenv (C99)

feholdexcept (C99)

feupdateenv (C99)

Macro constants

FE_ALL_EXCEPT FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW (C99)

FE_DOWNWARD FE_TONEAREST FE_TOWARDZERO FE_UPWARD (C99)

FE_DFL_ENV (C99)

 

Defined in header <<fenv.h>>
#define FE_DIVBYZERO    /*implementation defined power of 2*/		(since C99)
#define FE_INEXACT      /*implementation defined power of 2*/		(since C99)
#define FE_INVALID      /*implementation defined power of 2*/		(since C99)
#define FE_OVERFLOW     /*implementation defined power of 2*/		(since C99)
#define FE_UNDERFLOW    /*implementation defined power of 2*/		(since C99)
#define FE_ALL_EXCEPT  FE_DIVBYZERO | FE_INEXACT | \                        FE_INVALID | FE_OVERFLOW |  \                        FE_UNDERFLOW		(since C99)

All these macro constants (except FE_ALL_EXCEPT) expand to integer constant expressions that are distinct powers of 2, which uniquely identify all supported floating-point exceptions. Each macro is only defined if it is supported.

The macro constant FE_ALL_EXCEPT, which expands to the bitwise OR of all other FE_*, is always defined and is zero if floating-point exceptions are not supported by the implementation.

Constant	Explanation
FE_DIVBYZERO	division by zero occurred during the earlier floating-point operation
FE_INEXACT	inexact result: rounding was necessary to store the result of the earlier floating-point operation
FE_INVALID	invalid operation: the earlier floating-point operation could not performed
FE_OVERFLOW	the result of the earlier floating-point operation was too large to be representable
FE_UNDERFLOW	the result of the earlier floating-point operation was subnormal
FE_ALL_EXCEPT	bitwise OR of all supported floating-point exceptions

The implementation may define additional macro constants in <fenv.h> to identify additional floating-point exceptions. All such constants begin with FE_ followed by at least one uppercase letter.

See also

C++ documentation for floating point exception macros