Noob in need of help!

Hi,
So, I'm a complete noob and I wanted to try out a bit of Cocoa programming but got stuck prety soon.
Here's my problem:

I have this code:

#import "Fusebox.h"

@implementation Fusebox

- (IBAction)calculateAnswer:(id)sender

{

int i;

NSString *q1, *q2;

NSArray *questions;

    questions = [NSArray arrayWithObjects: q1, q2, nil];

q1 = @"question1";

q2 = @"question2";

i = (random() % 1) + 1;

[answerField setStringValue: questions objectAtIndex : i];

}

@end

And I have an interface with a text box (linked to the code thing as answerField).

When I call upon this execution it freezes for a second, and then quits out of the interface.

Please can anyone help me with this and how to improve the general coding here.

Thanks in advance,

Ric.