feraiseexcept
From cppreference.com
C
Concurrency support (C11)
Floating-point environment
Functions
(C99)
(C99)
feraiseexcept
(C99)
(C99)(C99)
(C99)(C99)
(C99)
(C99)
(C99)
Macro constants
(C99)
Defined in header
<fenv.h>
int feraiseexcept( int excepts );
(since C99)
Attempts to raise all floating-point exceptions listed in excepts (a bitwise OR of the floating-point exception macros). If one of the exceptions is FE_OVERFLOW or FE_UNDERFLOW , this function may additionally raise FE_INEXACT . The order in which the exceptions are raised is unspecified, except that FE_OVERFLOW and FE_UNDERFLOW are always raised before FE_INEXACT .
[edit] Parameters
excepts
-
bitmask listing the exception flags to raise
[edit] Return value
0 if all listed exceptions were raised, non-zero value otherwise.
[edit] Example
Run this code
#include <stdio.h> #include <fenv.h> #pragma STDC FENV_ACCESS ON void show_fe_exceptions(void) { printf ("current exceptions raised: "); if(fetestexcept (FE_DIVBYZERO )) printf (" FE_DIVBYZERO"); if(fetestexcept (FE_INEXACT )) printf (" FE_INEXACT"); if(fetestexcept (FE_INVALID )) printf (" FE_INVALID"); if(fetestexcept (FE_OVERFLOW )) printf (" FE_OVERFLOW"); if(fetestexcept (FE_UNDERFLOW )) printf (" FE_UNDERFLOW"); if(fetestexcept (FE_ALL_EXCEPT )==0) printf (" none"); feclearexcept (FE_ALL_EXCEPT ); printf ("\n"); } double some_computation(void) { /* Computation reaches a state that causes overflow. */ int r = feraiseexcept(FE_OVERFLOW | FE_INEXACT ); printf ("feraiseexcept() %s\n", (r?"fails":"succeeds")); return 0.0; } int main(void) { some_computation(); show_fe_exceptions(); return 0; }
Output:
feraiseexcept() succeeds current exceptions raised: FE_INEXACT FE_OVERFLOW
[edit] References
- C11 standard (ISO/IEC 9899:2011):
- 7.6.2.3 The feraiseexcept function (p: 210)
- C99 standard (ISO/IEC 9899:1999):
- 7.6.2.3 The feraiseexcept function (p: 191)
[edit] See also
C++ documentation for feraiseexcept