title: How to concatenate three string in iphone
body: <p>I have three string and I want them to concatenate but they are not concatenating. I am using this code.</p>
  
  <p>I want my last string to display like this:</p>
  
  <blockquote>
    <p>Cerenia Results 12Jun 2012.pdf</p>
  </blockquote>
  
  <p>like this </p>
  
  <pre><code>NSString *fileName = @"Cerenia Results";
  
  NSString* str = [formatter stringFromDate:date]; 
  
  NSString*extention=@".pdf";
  
  
  NSString * strRR = [NSString stringWithFormat:@"Cerenia Results_%@ [%@].pdf", extension];
  </code></pre>