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Showing content from https://cplusplus.com/reference/limits/float_round_style/ below:

type

<limits>

std::float_round_style

Enum type for float rounding style

Enumerated type with possible rounding styles for floating types. It is the type of member round_style in the numeric_limits class template.

It is defined as:

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enum float_round_style {
  round_indeterminate       = -1,
  round_toward_zero         = 0,
  round_to_nearest          = 1,
  round_toward_infinity     = 2,
  round_toward_neg_infinity = 3
};


With the following possible values:
label value meaning round_indeterminate -1 Rounding style cannot be determined at compile time round_toward_zero 0 Rounding style toward zero round_to_nearest 1 Rounding style to the nearest representable value round_toward_infinity 2 Rounding style toward infinity round_toward_neg_infinity 3 Rounding style toward negative infinity
The default value in the non-specialized numeric_limits class for its round_style member is round_toward_zero (0).

See also
numeric_limits
Numeric limits type (class template)

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