Enumeration Caseswift 6.0.3Swift

    down

    Round to the closest allowed value that is less than or equal to the source.

    case down
    Mangled symbol
    ss25FloatingPointRoundingRuleO4downyA2BmF What are these?
    FNV24 hash
    7DXJV

    The following example shows the results of rounding numbers using this rule:

    (5.2).rounded(.down)
// 5.0
(5.5).rounded(.down)
// 5.0
(-5.2).rounded(.down)
// -6.0
(-5.5).rounded(.down)
// -6.0

    This rule is equivalent to the C floor function and implements the roundToIntegralTowardNegative operation defined by the IEEE 754 specification.

    Other cases

    • case awayFromZero

      Round to the closest allowed value whose magnitude is greater than or equal to that of the source.

    • case toNearestOrAwayFromZero

      Round to the closest allowed value; if two values are equally close, the one with greater magnitude is chosen.

    • case toNearestOrEven

      Round to the closest allowed value; if two values are equally close, the even one is chosen.

    • case towardZero

      Round to the closest allowed value whose magnitude is less than or equal to that of the source.

    • case up

      Round to the closest allowed value that is greater than or equal to the source.