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.
| excepts | - | bitmask listing the exception flags to raise |
0 if all listed exceptions were raised, non-zero value otherwise.
#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
|
(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 |
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