.rounded()

💈範例

// ⭐️ .toNearestOrAwayFromZero (就是四捨五入)
(5.2).rounded()         //  5.0
(5.5).rounded()         //  6.0
(-5.2).rounded()        // -5.0
(-5.5).rounded()        // -6.0

let x = 6.5

// use rounding rules
x.rounded(.toNearestOrAwayFromZero)    // round: 7.0
x.rounded(.towardZero))                // trunc: 6.0 ⭐️ 
x.rounded(.up)                         // ceil : 7.0 ⭐️ 
x.rounded(.down)                       // floor: 6.0 ⭐️ 

// ⭐️ Int
Int(3.25)        //  3
Int(3.7)         //  3
Int(-3.3)        // -3
Int(-3.7)        // -3

📘 手冊

• Swift ⟩

  • Double ⟩

    • .rounded() - use .toNearestOrAwayFromZero rounding rule.

    • .rounded(_:) - use other rounding rules.

    • .round(), .round(_:) - round in place.

  • FloatingPoint ⟩

    • .round(_:)

  • Int ⟩

    • init(_:)