title: How do i write the if - else if code properly
body: <p>I'm trying to make an if - else if statement writing two comparison operators in the 'else if' line (Int type). maybe is the syntax wrong?</p>
  
  <p>i've tried to remove the parentheses from 'boysAge >= 21' but same results</p>
  
  <pre><code>var boysAge = 21
  var message = "The customer is "
  if boysAge &lt; 21 {
      message += "underage"
  }
  else if (boysAge &gt;= 21) &amp;&amp; &lt;70 {
      message += "allowed"
  }
  print(message)
  </code></pre>
  
  <p>xcode says that '&lt;' is not a prefix unary operator</p>