title: iOS: Multiply two values
body: <p>I'm making my first iOS app. I simply want to multiply the value from pressureField with temperatureField.
  I used a helloiPhone.app to get things going.  So everything is working if I use one field, but I don't know how to set the value of h to two multiplied vars.</p>
  
  <p>Here's what my mainview.m looks like:</p>
  
  <pre><code>- (void) sayHello: (id) sender {
      h = 23;
      helloLabel.text =
          [NSString stringWithFormat: @"%.2f", h];
      [pressureField resignFirstResponder];
      [tempField resignFirstResponder];
      tempField.text = @"";
      pressureField.text = @"";
  }
  </code></pre>
  
  <p>I'm NEW to Objective C...so be easy on me. I'm just hobbying. :)</p>