feraiseexcept
From cppreference.com
| 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.
Contents |
[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
| (C99) |
clears the specified floating-point status flags (function) |
| (C99) |
determines which of the specified floating-point status flags are set (function) |
| C++ documentation for feraiseexcept
| |
