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std:: feclearexcept

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C++
Numerics library
Floating-point environment
Functions
feclearexcept
(C++11)
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(C++11)
Defined in header <cfenv>
int feclearexcept ( int excepts ) ;
(since C++11)

Attempts to clear the floating-point exceptions that are listed in the bitmask argument excepts , which is a bitwise OR of the floating point exception macros .

Contents

Parameters

excepts - bitmask listing the exception flags to clear

Return value

​ 0 ​ if all indicated exceptions were successfully cleared or if excepts is zero. Returns a non-zero value on error.

Example

Run this code 
#include <cfenv>
#include <cmath>
#include <iostream>
// #pragma STDC FENV_ACCESS ON
volatile double zero = 0.0; // volatile not needed where FENV_ACCESS is supported
volatile double one = 1.0;  // volatile not needed where FENV_ACCESS is supported
int main()
{
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout <<  "1.0/0.0 = " << 1.0 / zero << '\n';
    if (std::fetestexcept(FE_DIVBYZERO))
        std::cout << "division by zero reported\n";
    else
        std::cout << "division by zero not reported\n";
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout << "1.0/10 = " << one / 10 << '\n';
    if (std::fetestexcept(FE_INEXACT))
        std::cout << "inexact result reported\n";
    else
        std::cout << "inexact result not reported\n";
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout << "sqrt(-1) = " << std::sqrt(-1) << '\n';
    if (std::fetestexcept(FE_INVALID))
        std::cout << "invalid result reported\n";
    else
        std::cout << "invalid result not reported\n";
}

Possible output: 

1.0/0.0 = inf
division by zero reported
1.0/10 = 0.1
inexact result reported
sqrt(-1) = -nan
invalid result reported

See also

(C++11)
determines which of the specified floating-point status flags are set
(function)
C documentation for feclearexcept