Format float value with 2 decimal places [duplicate]

Question

How can I round the result to 2 decimal places and show it on the result label? I found some statements, but I´m new to Swift and it is actually difficult for me to rebuild the samples for my project.

import UIKit  class ViewController: UIViewController {          @IBOutlet var txt: UITextField!          @IBOutlet var l5: UILabel!     @IBOutlet var l10: UILabel!     @IBOutlet var l15: UILabel!     @IBOutlet var l20: UILabel!     @IBOutlet var l25: UILabel!     @IBOutlet var l30: UILabel!     @IBOutlet var l35: UILabel!     @IBOutlet var l40: UILabel!          @IBAction func Berechnen(sender: AnyObject) {                  var Zahl = (txt.text as NSString).floatValue                  l5.text  = "\((Zahl / 95) * (100))"         l10.text = "\((Zahl / 90) * (100))"         l15.text = "\((Zahl / 85) * (100))"         l20.text = "\((Zahl / 80) * (100))"         l25.text = "\((Zahl / 75) * (100))"         l30.text = "\((Zahl / 70) * (100))"         l35.text = "\((Zahl / 65) * (100))"         l40.text = "\((Zahl / 60) * (100))"     }          func textFieldShouldReturn(textField: UITextField) -> Bool {         self.view.endEditing(true)         return false     }  } 

Answer 1

You can use standard string formatting specifiers to round to an arbitrary number of decimal places. Specifically %.nf where n is the number of decimal places you require:

let twoDecimalPlaces = String(format: "%.2f", 10.426123) 

Assuming you want to display the number on each of the l* labels:

@IBAction func Berechnen(sender: AnyObject) {      var Zahl = (txt.text as NSString).floatValue      l5.text  = String(format: "%.2f", (Zahl / 95) * 100)     l10.text = String(format: "%.2f", (Zahl / 90) * 100)     l15.text = String(format: "%.2f", (Zahl / 85) * 100)     l20.text = String(format: "%.2f", (Zahl / 80) * 100)     l25.text = String(format: "%.2f", (Zahl / 75) * 100)     l30.text = String(format: "%.2f", (Zahl / 70) * 100)     l35.text = String(format: "%.2f", (Zahl / 65) * 100)     l40.text = String(format: "%.2f", (Zahl / 60) * 100) }