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Stores the floating-point environment's exception status flags

#include <fenv.h>
int fegetexceptflag ( fexcept_t *flagp , int excepts  );

The fegetexceptflag( ) function saves the current state of specified status flags in the floating-point environment, which indicate specific floating-point processing exceptions, in the object referenced by the pointer argument. The object type that represents the floating-point status flags, fexcept_t, is defined in fenv.h. Unlike the integer argument that represents the floating-point exception status flags in this and other functions that manipulate the floating-point environment, the object with type fexcept_t cannot be directly modified by user programs.

The integer argument is a bitwise OR of the values of macros defined in fenv.h to represent the floating-point exception flags. The macros are listed under feraiseexcept( ) in this chapter. fegetexceptflag( ) stores the state of those flags which correspond to the values that are set in this mask.

The function returns 0 if successful; a nonzero return value indicates that an error occurred.


/* Temporarily store the state of the FE_INEXACT, FE_UNDERFLOW
 * and FE_OVERFLOW flags
fexcept_t fpexcepts;

/* Save state: */
fegetexceptflag( &fpexcepts, FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW );


/* ... Perform some calculations that might raise those exceptions ... */

/* ... Handle (or ignore) the exceptions our calculations raised ... */

/* Restore state as saved: */
fesetexceptflag( &fpexcepts, FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW );

See Also

fesetexceptflag( ), feraisexcept( ), feclearexcept( ), fetestexcept( )

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