title: How can I use an Object in an Object
body: <p>I am trying to put an object as a property into another object:</p>
  
  <pre><code>    @interface Options
  {
        Guarantor *guarantors;
        NSString *success_message;
        NSString *source;
  }
  
  @end
  </code></pre>
  
  <p>And this is my Guarantor object:</p>
  
  <pre><code>@interface Guarantor{
     BOOL *status;
     NSString *message;
     NSInteger *number;
  
  }
  
  @end
  </code></pre>
  
  <p>I am met with an error that says <code>unknown type name Guarantor</code>?
  Why is this?</p>