title: iPhone app issue getting result of equation to display on screen
body: <p>So I'm trying to create an iphone app that does simple temperature conversion and when I run the code enter my number and hit submit nothing is displayed. I can't seem to find the problem here is my header file</p>
  
  <pre><code>#import &lt;UIKit/UIKit.h&gt;
  @interface ViewController : UIViewController
  @property (weak, nonatomic) IBOutlet UISegmentedControl *convtype;
  @property (weak, nonatomic) IBOutlet UITextField *inputtemp;
  @property (weak, nonatomic) IBOutlet UIButton *submit;
  @property (weak, nonatomic) IBOutlet UILabel *outputtemp;
  @end
  </code></pre>
  
  <p>Basically I have a UISegmentedController to select which conversion to do (0 is c to f and 1 is f to c)</p>
  
  <p>I have a text field inputtemp for the temperature to convert. Submit is the submit button and a UIlabel outputtemp is where I want the result to be displayed.</p>
  
  <p>Not quite sure where this is going wrong here is the rest of my code in the .m file</p>
  
  <pre><code>#import "ViewController.h"
  
  @interface ViewController ()
  
  @end
  
  @implementation ViewController
  @synthesize convtype;
  @synthesize inputtemp;
  @synthesize submit;
  @synthesize outputtemp;
  
  - (void)viewDidLoad
  {
  inputtemp.keyboardType = UIKeyboardTypeDecimalPad;
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  }
  </code></pre>
  
  <p>...</p>
  
  <pre><code>- (IBAction)submit:(id)sender {
  
  //defines input text
  float temperature = [[inputtemp text] floatValue];
  float sum = 0;
  
  //selects formula based on convtype segment control
  if (convtype.selectedSegmentIndex == 0) {
      sum = (temperature * 9) / 5 + 32;
  }
  else if (convtype.selectedSegmentIndex == 1) {
      sum = (temperature - 32) * 9 / 5; 
  }
  
  //outputs to screen
  [outputtemp setText:[NSString stringWithFormat:@"%3.2f", sum]];
  }
  
  
  @end
  </code></pre>
  
  <p>Is the problem with the setText? I'm not quite sure how to manipulate the ui label</p>