title: How can I add Variables into a String?(Swift)
body: <p>I want to add some variables to a string:</p>
  
  <pre><code>var age:Int
  var pets:String
  lblOutput.text = "Your"+ var pets +"is"+ var age +"years old!"
  </code></pre>
  
  <p>The both variables aren't nil. And i think this is how it worked in objective-c, wasn't it? </p>
  
  <p>Thanks!</p>