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POIn C#, can multiplications inside of an array declaration/initialization cause mayhem?
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  1. POIn C#, can multiplications inside of an array declaration/initialization cause mayhem?
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    copied!<p>I am going a bit crazy here with the following section of code</p> <pre><code> public static readonly float f = 1.25f; public static void init(){ Debug.Log(f); // output: 1.25f FLIPPER_CENTERS = new float[,] { { (20*f), (27*f) }, { FLIPPER_WIDTH - (20*f), (27*f)}, { (6*f), (25*f) }, { MH_FLIPPER_WIDTH- (6*f), (25*f) }, { (8), (15)}, { (SMALL_FLIPPER_WIDTH - 8), (15)}, { (8), (20)}, { (67 - 8), (20)}, }; Debug.Log(FLIPPER_CENTERS[0,0]); // output: 0, expected 25; } </code></pre> <p>If I print the values of the first element of that array, I get <code>[0, 0]</code>. The last two elements are <code>[59, 20]</code>, as expected.</p> <p>The first value is supposed to be <code>[25, 33,75]</code>. Which I can get if I substitute <code>(20*f)</code> for <code>(20*1.25f)</code>.</p> <pre><code> { (20*1.25f), (27*1.25f) }, { FLIPPER_WIDTH - (20*f), (27*f)}, </code></pre> <p><strong>So here is the problem: if I leave the multiplication by f in the array initialization, the values are 0. However, if I change <code>f</code> to <code>1.25f</code> all is good.</strong></p> <p>I have tried to figure out what is going on, but to no avail. I am certain the value of <code>f</code> is <code>1.25f</code> and not <code>0</code>. Can anyone shed some light on this for me please?</p> <p>Edit:</p> <p>To prove that <code>f</code> is not <code>0</code>, I've tried <code>20/f</code> for the first element. That didn't throw an exception and the output was still <code>0</code>.</p> <p><strong>Partial Solution</strong></p> <p>Changing <code>f</code> from <code>readonly</code> to <code>const</code> solves the problem. However, I would really much like to know why this is happening.</p> <pre><code> public const float f = 1.25f; </code></pre> <p>All this is running in Unity, it may have something to do with it.</p>
 

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