title: What is the default condition set to?
body: <p>I'm making my way through the documentation and came across this code and i want to know what '{0}' is for? and why the ',n' afterwards? I tinkered around and understand what happens if they're not there but i'd like to be able to word it in my head so can someone please explain what is happening?</p>
  
  <pre><code>static void Main(string[] args) {
      int n = args.Length;
      switch (n) {
          case 0:
              Console.WriteLine("No arguments");
              break;
          case 1:
              Console.WriteLine("One argument");
              break;
          default:
              Console.WriteLine("{0} arguments", n);
              break;
      }
  }
  </code></pre>