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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/../c/types/limits/FLT_ROUNDS.html below:

FLT_ROUNDS - cppreference.com

#define FLT_ROUNDS /* implementation defined */

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

Value Explanation -1 the default rounding direction is not known 0 toward zero; same meaning as FE_TOWARDZERO 1 to nearest; same meaning as FE_TONEAREST 2 towards positive infinity; same meaning as FE_UPWARD 3 towards negative infinity; same meaning as FE_DOWNWARD other values implementation-defined behavior [edit] Notes

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

[edit] See also

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