📅  最后修改于: 2020-09-25 07:17:42             🧑  作者: Mango
fetestexcept() 函数在
int fetestexcept( int excepts );
fetestexcept() 函数测试当前是否设置了excepts指定的浮点异常。参数excepts
是浮点异常宏的按位或。
#include
#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(void)
{
print_exceptions();
feraiseexcept(FE_INVALID|FE_DIVBYZERO);
print_exceptions();
feclearexcept(FE_ALL_EXCEPT);
print_exceptions();
return 0;
}
运行该程序时,输出为:
Raised exceptions: None
Raised exceptions: FE_DIVBYZERO FE_INVALID
Raised exceptions: None