title: Why I am getting error for simple addition operation in Swift playground?
body: <p>I have very simple code,</p>
  
  <pre><code>var i = 1
  var f = 10.34
  
  println("i = \(i)") //fine
  println("f = \(f)") //fine
  println("i + f = \(i + f)")//error --&gt; could not find member init 
  </code></pre>
  
  <p>Now why I am getting error in last line? Am I not allowed to write expression with different data type in println?</p>