📅  最后修改于: 2020-09-25 07:12:25             🧑  作者: Mango
fetgetexceptflag() 函数在
int fegetexceptflag(fexcept_t* flagp, int excepts);
参数excepts可以是浮点异常宏的按位或。
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 |
#include
#include
#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;
}
运行该程序时,输出为:
Raised exceptions: FE_DIVBYZERO
Raised exceptions: FE_DIVBYZERO FE_INVALID FE_OVERFLOW
Raised exceptions: FE_DIVBYZERO