fegetexceptflag() function in C/C++

Last Updated : 25 Sep, 2018

The fegetexceptflag() function in C/C++ is specified in header file fenv.h and gets floating point exception flags. This function store the raised exception in the point specified by flagp .

Syntax:

int fegetexceptflag(fexcept_t* flagp, int excepts)

Parameters: The function accepts two mandatory parameters which are described below:

flagp : signifies the pointer to a fexcept_t object where the representation is stored.
excepts : signifies the bitmask value.

Macro –> Description:

FE_DIVBYZERO –> Pole error: Division by zero.
FE_INEXACT –> Inexact: The result is not exact.
FE_INVALID –> Domain error: At least one of the arguments is a value for which the function is not defined.
FE_OVERFLOW –> Overflow range error: The result is too large.
FE_UNDERFLOW –> Underflow range error: The result is too small.
FE_ALL_EXCEPT –> All exceptions.

Return value : The function returns two value as below:

Zero: on success.
Non-zero: on failure

Below programs illustrate the above function:
Program 1 :

// C++ program to illustrate 
// fegetexceptflag() function 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // bitmask value 
    fexcept_t excepts; 
  
    // divided by zero exception 
    feraiseexcept(FE_DIVBYZERO); 
  
    // current state is saved 
    fegetexceptflag(&excepts, FE_ALL_EXCEPT); 
    cout << "Exception raised -> \n"; 
  
    // print the exception occurred 
    if (fetestexcept(FE_ALL_EXCEPT)) { 
        if (fetestexcept(FE_DIVBYZERO)) 
            cout << "FE_DIVBYZERO \n"; 
        if (fetestexcept(FE_INEXACT)) 
            cout << "FE_INEXACT \n"; 
        if (fetestexcept(FE_INVALID)) 
            cout << "FE_INVALID \n"; 
        if (fetestexcept(FE_OVERFLOW)) 
            cout << "FE_OVERFLOW \n"; 
        if (fetestexcept(FE_UNDERFLOW)) 
            cout << "FE_UNDERFLOW \n"; 
        if (fetestexcept(FE_ALL_EXCEPT)) 
            cout << "FE_ALL_EXCEPT \n"; 
    } 
    else
        cout << "None"; 
  
    return 0; 
} 

Output:

Exception raised -> 
FE_DIVBYZERO 
FE_ALL_EXCEPT

Program 2 :

// C++ program to illustrate 
// fegetexceptflag() function 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // bitmask value 
    fexcept_t excepts; 
  
    // raised exception 
    feraiseexcept(FE_ALL_EXCEPT); 
  
    // current state is saved 
    fegetexceptflag(&excepts, FE_ALL_EXCEPT); 
    cout << "Exception raised -> \n"; 
  
    // print the exception occurred 
    if (fetestexcept(FE_ALL_EXCEPT)) { 
        if (fetestexcept(FE_DIVBYZERO)) 
            cout << "FE_DIVBYZERO \n"; 
        if (fetestexcept(FE_INEXACT)) 
            cout << "FE_INEXACT \n"; 
        if (fetestexcept(FE_INVALID)) 
            cout << "FE_INVALID \n"; 
        if (fetestexcept(FE_OVERFLOW)) 
            cout << "FE_OVERFLOW \n"; 
        if (fetestexcept(FE_UNDERFLOW)) 
            cout << "FE_UNDERFLOW \n"; 
        if (fetestexcept(FE_ALL_EXCEPT)) 
            cout << "FE_ALL_EXCEPT \n"; 
    } 
    else
        cout << "None"; 
  
    return 0; 
} 

Output:

Exception raised -> 
FE_DIVBYZERO 
FE_INEXACT 
FE_INVALID 
FE_OVERFLOW 
FE_UNDERFLOW 
FE_ALL_EXCEPT

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AmanSrivastava1

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fegetexceptflag() function in C/C++

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