Round Issue in swift

Question

I have this Info.

let params2: [String: AnyObject] = [
    \"app_token\": myapptoken,
    \"member_access_token\": accessToken!,
    \"pay_process\": 0,
             


        

Answer 1

Try using this function:

let price: Double = 9.87

func roundDouble(num: Double) -> Float {

  //Create NSDecimalNumberHandler to specify rounding behavior
  let numHandler = NSDecimalNumberHandler(roundingMode: NSRoundingMode.RoundDown, scale: 2, raiseOnExactness: false, raiseOnOverflow: false, raiseOnUnderflow: false, raiseOnDivideByZero: false)

  let roundedNum = NSDecimalNumber(double: num).decimalNumberByRoundingAccordingToBehavior(numHandler)

  //Convert to float so you don't get the endless repeating decimal.
  return Float(roundedNum)

}

roundDouble(price) //9.87

I think the best thing to do here is to explicitly use a float instead of a double because the precision of a double is not necessary if you only want two decimal places. This function just helps round it a bit more accurately.