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

FE_DFL_ENV - cppreference.com

#define FE_DFL_ENV  /*implementation defined*/

The macro constant FE_DFL_ENV expands to an expression of type const fenv_t*, which points to a full copy of the default floating-point environment, that is, the environment as loaded at program startup.

Additional macros that begin with FE_ followed by uppercase letters, and have the type const fenv_t*, may be supported by an implementation.

Output:

On startup:
current exceptions raised:  none
current rounding method:    FE_TONEAREST
 
Before restoration:
current exceptions raised:  FE_INVALID
current rounding method:    FE_DOWNWARD
 
After restoring default environment:
current exceptions raised:  none
current rounding method:    FE_TONEAREST

• C11 standard (ISO/IEC 9899:2011):

• 7.6/9 Floating-point environment <fenv.h> (p: 208)

• C99 standard (ISO/IEC 9899:1999):

• 7.6/8 Floating-point environment <fenv.h> (p: 188-189)

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