title: Swift 3: Replacing a "," with a "." in Double
body: <p>I‘m making my first own calculate app in Swift 3.
  Everything is working fine expect decimal numbers.
  Here in Germany is on the Decimal Pad a "," instead of a "."
  Unfortunately you can‘t calculate with a "," in Swift.
  Do you have any tips for me how to replace a "," with a "." in my project ?
  Thanks tobi</p>
  
  <pre><code>let a = Double(WertA.text!)
  let b = Double(WertB.text!)
  
  let result = a! + b!
  Ergebnis.text = String("/result")
  </code></pre>