fetestexcept - test floating-point exception flags
#include <fenv.h>
int fetestexcept(int excepts);
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.The fetestexcept() function shall determine which of a specified subset of the floating-point exception flags are currently set. The excepts argument specifies the floating-point status flags to be queried.
The fetestexcept() function shall return the value of the bitwise-inclusive OR of the floating-point exception macros corresponding to the currently set floating-point exceptions included in excepts.
No errors are defined.
The following example calls function f() if an invalid exception is set, and then function g() if an overflow exception is set:
#include <fenv.h> /* ... */ { #pragma STDC FENV_ACCESS ON int set_excepts; feclearexcept(FE_INVALID | FE_OVERFLOW); // maybe raise exceptions set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW); if (set_excepts & FE_INVALID) f(); if (set_excepts & FE_OVERFLOW) g(); /* ... */ }
None.
None.
None.
feclearexcept(), fegetexceptflag(), feraiseexcept(), the Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>
First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.