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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/numeric/fenv/feenv.html below:

fegetenv, fesetenv - cppreference.com

int fegetenv( fenv_t* envp );

(1) (since C99)

int fesetenv( const fenv_t* envp );

(2) (since C99)

1) Attempts to store the status of the floating-point environment in the object pointed to by envp.

2) Attempts to establish the floating-point environment from the object pointed to by envp. The value of that object must be previously obtained by a call to feholdexcept or fegetenv or be a floating-point macro constant. If any of the floating-point status flags are set in envp, they become set in the environment (and are then testable with fetestexcept), but the corresponding floating-point exceptions are not raised (execution continues uninterrupted)

[edit] Parameters envp - pointer to the object of type fenv_t which holds the status of the floating-point environment [edit] Return value

​0​ on success, non-zero otherwise.

[edit] Example

Output:

current exceptions raised: none
current rounding method:   FE_TONEAREST
 
+11.5 -> +12.0
+12.5 -> +12.0
current exceptions raised: FE_INEXACT
current rounding method:   FE_TONEAREST
 
1.0/0.0 = inf
+11.5 -> +11.0
+12.5 -> +12.0
current exceptions raised: FE_DIVBYZERO FE_INEXACT
current rounding method:   FE_DOWNWARD
 
current exceptions raised: FE_INEXACT
current rounding method:   FE_TONEAREST
[edit] References
[edit] See also saves the environment, clears all status flags and ignores all future errors
(function) [edit] restores the floating-point environment and raises the previously raise exceptions
(function) [edit] default floating-point environment
(macro constant) [edit]

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