The fetgetexceptflag() function is defined in <cfenv> header file.
fegetexceptflag() prototype
int fegetexceptflag(fexcept_t* flagp, int excepts);
The argument excepts may be a bitwise OR of the floating point exception macros.
fegetexceptflag() Parameters
- flagp: A pointer to an fexcept_t object where the flags will be stored.
- excepts: Bitmask listing of exception flags to get.
| Macro | Type | Description |
|---|---|---|
| FE_DIVBYZERO | Pole error | Division by zero |
| FE_INEXACT | Inexact | Not exact results such as (1.0/3.0) |
| FE_INVALID | Domain error | At least one arguments used is a value for which the function is not defined |
| FE_OVERFLOW | Overflow range error | Result is too large in magnitude to be represented by the return type |
| FE_UNDERFLOW | Underflow range error | Result is too small in magnitude to be represented by the return type |
| FE_ALL_EXCEPT | All exceptions | All exceptions supported by the implementation |
fegetexceptflag() Return value
- The fegetexceptflag() function returns zero on success, nonzero otherwise.
Example: How fegetexceptflag() function works?
#include <iostream>
#include <cfenv>
#pragma STDC FENV_ACCESS ON
using namespace std;
void print_exceptions()
{
cout << "Raised exceptions: ";
if(fetestexcept(FE_ALL_EXCEPT))
{
if(fetestexcept(FE_DIVBYZERO))
cout << "FE_DIVBYZERO ";
if(fetestexcept(FE_INEXACT))
cout << "FE_INEXACT ";
if(fetestexcept(FE_INVALID))
cout << "FE_INVALID ";
if(fetestexcept(FE_OVERFLOW))
cout << "FE_OVERFLOW ";
if(fetestexcept(FE_UNDERFLOW))
cout << "FE_UNDERFLOW ";
}
else
cout << "None";
cout << endl;
}
int main()
{
fexcept_t excepts;
feraiseexcept(FE_DIVBYZERO);
/* save current state*/
fegetexceptflag(&excepts,FE_ALL_EXCEPT);
print_exceptions();
feraiseexcept(FE_INVALID|FE_OVERFLOW);
print_exceptions();
/* restoring previous exceptions */
fesetexceptflag(&excepts,FE_ALL_EXCEPT);
print_exceptions();
return 0;
}
When you run the program, the output will be:
Raised exceptions: FE_DIVBYZERO Raised exceptions: FE_DIVBYZERO FE_INVALID FE_OVERFLOW Raised exceptions: FE_DIVBYZERO
