title: understanding difference between int and setting variable equal to a number
body: <p>What is the difference between setting a variable like</p>
  <pre><code>var eventNumber: Int = 1 
  </code></pre>
  <p>and</p>
  <pre><code>var eventNumber = 1
  </code></pre>
  <p>Do I have to declare eventNumber as a Int?</p>
  <p>I am using it essentially as a stepper. so depending on what took place before an action, I would call</p>
  <pre><code>eventNumber += 1
  </code></pre>