title: "Dead Store" Warning in Xcode
body: <p>I am getting a dead store warning when I analyze my project but the project does not crash.
  Here is what I am doing</p>
  
  <pre><code>NSString *graphUrl = nil;
  
  if ([graphArray count] == 1)
  {
      objTrial = [graphArray objectAtIndex:0];
  
      graphUrl = @"http://chart.apis.google.com/chart?cht=s:nda&amp;chf=bg,s,FFFFFF&amp;chs=";
  
      graphUrl = [graphUrl stringByAppendingString:@"&amp;chd=t:"];
      graphUrl = [graphUrl stringByAppendingString:objTrial.highValue];// get the dead store error here
  
  }
  else
  {
      //someother operation is done and a value is loaded to aURL
  }
  </code></pre>
  
  <p>I get a dead store warning as mentioned in the code.. How can I prevent this?</p>
  
  <p>It would be great if someone could help me out in this</p>