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    <p><strike>You are not initializing your array (on line 1) and are pointing to unused memory. It should be</p> <pre><code>NSMutableArray *numbersArray = [[NSMutableArray alloc] init]; </code></pre> <hr> <p>What you are doing is different from pointing to <code>nil</code> which is safe. If you would have done</p> <pre><code>NSMutableArray *numbersArray = nil; </code></pre> <p>you would have seen that the array was always empty because it was sending a message to <code>nil</code> causes nothing to happen (e.g. adding objects to <code>nil</code> don't do anything at all).</strike></p> <hr> <h2>Update (after your edit):</h2> <p>Your code runs fine. You are probably just not getting what it does. </p> <p>Your first few lines create an array with 34 values that are all <code>-1</code></p> <pre><code>NSMutableArray *numbersArray = [[NSMutableArray alloc] init]; for (int i = 0; i&lt;34; i++) { numbersArray[i] = [NSNumber numberWithInt:-1]; } </code></pre> <p>You then randomize one integrer value between 0 and 33</p> <pre><code>int r = rand()%34; </code></pre> <p>And then "while" the array of all -1's contain that number you randomize a new number. </p> <p>Since your first number is positive and the array is filled with all -1's you never enter the body of the loop so your code just steps over it.</p> <pre><code>while ([numbersArray containsObject:[NSNumber numberWithInt:r]]) { //it breaks here r = rand()%34; } </code></pre> <p><strong>I can't really understand what you are trying to do but this is what your code is currently doing. (It works but is quite pointless)</strong></p>
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    1. USDavid Rönnqvist
    1. USDavid Rönnqvist
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    1. COActually I am, I forgot that line of code, sorry.
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    2. COI left it empty, but the break remains...
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    3. COAt this day, I would suppose he's using ARC. So the `nil`-initialization is there by default.
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      1. USpatric.schenke
 

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