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POHow to create simple addition in Objective-C?
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  1. POHow to create simple addition in Objective-C?
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    copied!<p>I have a simple iPhone project open in Xcode. In the storyboard file i have a view controller with : 2 text fields 1 label 1 round rect button</p> <p>What I am trying to do is the following: Have the user enter any number in field A, then the same on field B. Then once the "Submit" button has been pressed, I would like the app to add the two values. </p> <p>So far this is the code that I have but I am currently stuck as I am getting an error on build.</p> <p>My Header file: </p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface ADDViewController : UIViewController @property (copy,nonatomic) NSString *valueA; @property (copy,nonatomic) NSString *valueB; @end </code></pre> <p>My Implementation File:</p> <pre><code>#import "ADDViewController.h" @interface ADDViewController () - (IBAction)submitButton:(id)sender; @property (weak, nonatomic) IBOutlet UITextField *numberA; @property (weak, nonatomic) IBOutlet UITextField *numberB; @property (weak, nonatomic) IBOutlet UILabel *answerLabel; @end @implementation ADDViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (IBAction)submitButton:(id)sender { self.valueA = self.numberA.text; self.valueB = self.numberB.text; // THE FOLLOWING IS WHERE I AM CURRENTLY GETTING AN ERROR WITH XCODE: // XCODE SAYS : INVALID OPERANDS TO BINARY EXPRESSION ('NSSTRING *' AND 'NSSTRING *') NSString * total = self.valueA + self.valueB; } @end </code></pre> <p>And this is a screen shot of my story board file:</p> <p><a href="http://i43.tinypic.com/352q98i.jpg" rel="nofollow">http://i43.tinypic.com/352q98i.jpg</a></p> <p>Thank you in advance!</p>
 

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