fetestexcept

fetestexcept

Test floating point exception flags

Portability: C99

SYNOPSIS
DESCRIPTION
RETURN VALUE
CAUTIONS
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

   #include <fenv.h>

   int fetestexcept(int excepts);

DESCRIPTION

fetestexcept is used to test the exception flag settings in the current floating-point environment. The excepts argument is the sum of one or more floating-point exception names indicating which flags are to be tested.

RETURN VALUE

fetestexcept returns the sum of the exception names for the subset of the requested exceptions which are set in the current environment.

CAUTIONS

fetestexcept has no meaning when called from a function whose default floating-point format is hexadecimal, that is, one compiled without the bfp option. If called, it returns zero.

A program which calls fegetenv must use the standard FENV_ACCESS pragma in an enclosing scope, or the effects are unpredictable.

RELATED FUNCTIONS

feclearexcept, fegetexceptflag, feraiseexcept, fesetexceptflag

SEE ALSO

"Mathematical Functions" in Chapter 2, "Function Categories"

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