swift - Swift Round up / Max the NSDecimalNumber

Question

假设我们有一个NSDecimal常量total，它包含 3.33333333 除以 10/3 的值。10和3都是NSDecimalNumber。NSDecimalNumber在 Swift 中，我们希望总数为 4 。

let total = ten/three

// the ideal total would be rounded up whenever there is a floating 

在文档中。我们有

func NSDecimalRound(_ result: UnsafeMutablePointer<NSDecimal>,
                  _ number: UnsafePointer<NSDecimal>,
                  _ scale: Int,
                  _ roundingMode: NSRoundingMode)


maximumDecimalNumber()

哪一个最适合货币风格的计算器？如果你知道的话，请包括一个如何使用它们的例子。谢谢你 。

Answer 1

let x = NSDecimalNumber(string:"10")
let y = NSDecimalNumber(string:"3")
let total = x.decimalNumberByDividingBy(y).decimalNumberByRoundingAccordingToBehavior( NSDecimalNumberHandler(roundingMode: NSRoundingMode.RoundUp, scale: 0, raiseOnExactness: false, raiseOnOverflow: false, raiseOnUnderflow: false, raiseOnDivideByZero: false))   // 4