FLT_ROUNDS

Defined in header `<cfloat>`
#define FLT_ROUNDS /* implementation defined */		(since C++11)

Specifies the current rounding direction of floating-point arithmetic operations.

Value	Explanation
`-1`	the default rounding direction is not known
`0`	toward zero, `FE_TOWARDZERO`
`1`	to nearest, `FE_TONEAREST`
`2`	towards positive infinity, `FE_UPWARD`
`3`	towards negative infinity, `FE_DOWNWARD`
other values	implementation-defined behavior

The rounding mode can be changed with std::fesetround and FLT_ROUNDS reflects that change.

The possible values of FLT_ROUNDS match the possible values of std::float_round_style, returned by std::numeric_limits::round_style.

float_round_style	indicates floating-point rounding modes (enum)
fegetroundfesetround (C++11)(C++11)	gets or sets rounding direction (function)
C documentation for `FLT_ROUNDS`