The **`feholdexcept` function** saves the present `floating point environment`. It then sets the present values of `floating point status flags` again.

# Prototype
The function prototype is as follows:
```C++
int feholdexcept( fenv_t* env )
```

# Parameters
`env` - pointer to object
of type `fenv_t`. It contains the present status of the `floating point environment`.


# Example
The code below shows the use of the `feholdexcept` function. The function is used to prevent exceptions in case of overflow and division by zero, as shown in line 12:

#include <stdio.h>
#include <float.h>
#include <fenv.h>
 
#pragma STDC FENV_ACCESS ON
 
void show_fe_excepts(void)
{
    printf("exceptions raised: ");
    if(fetestexcept(FE_DIVBYZERO))     printf(" FE_DIVBYZERO");
    if(fetestexcept(FE_INVALID))       printf(" FE_INVALID");
    if(fetestexcept(FE_ALL_EXCEPT)==0) printf(" none");
    printf("\n");
}
 
double func (double x)   
{
    fenv_t curr_excts;
    // Save and clear current f-p environment.
    feholdexcept(&curr_excts); 
    // Raise inexact exceptions.
    printf("In func():  x = %f\n", x = x/0);
    show_fe_excepts();
    // clear exception
    feclearexcept(FE_DIVBYZERO); 
    // calling the function
    feupdateenv(&curr_excts);
    return x;
}
 
int main(void)
{    
    show_fe_excepts();
    printf("func(DBL_MAX) = %f\n", func(DBL_MAX));
    show_fe_excepts();
 
    return 0;
}

What is feholdexcept in C ?

The feholdexcept function saves the current floating point environment and resets status flags to prevent overflow and division by zero exceptions.

What is feholdexcept in C ?

Prototype

Parameters

Return value

Example