TA貢獻1836條經驗 獲得超3個贊
round
Double
let x = 1.23556789let y = Double(round(1000*x)/1000)print(y) // 1.236
printf(...)String(format: ...)Double.
編輯：
TA貢獻1934條經驗 獲得超2個贊
extension Double {
/// Rounds the double to decimal places value func roundToPlaces(places:Int) -> Double {
let divisor = pow(10.0, Double(places))
return round(self * divisor) / divisor }}roundrounded:
extension Double {
/// Rounds the double to decimal places value func rounded(toPlaces places:Int) -> Double {
let divisor = pow(10.0, Double(places))
return (self * divisor).rounded() / divisor }}let x = Double(0.123456789).roundToPlaces(4) // x becomes 0.1235 under Swift 2 let x = Double(0.123456789).rounded(toPlaces: 4) // Swift 3 version
TA貢獻1865條經驗 獲得超7個贊
我怎樣才能把這個算到，比方說，1.543呢？ 當我打印totalWorkTimeInHours?
totalWorkTimeInHoursStringformat
print(String(format: "%.3f", totalWorkTimeInHours))
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