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<br />
From this site:<br />
<a href="http://www.concentric.net/~ttwang/tech/javafloat.htm" rel="ugc">http://www.concentric.net/~ttwang/tech/javafloat.htm</a><br />
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All boolean operations involving &quot;NaN&quot; results in a false value. <br />
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That is just convention as I understand
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<br />
More examples from the same site.<br />
No direct exmaple like yours Float.NaN == Float.NaN<br />
&nbsp;- but definitiona bove requires that it wouyld be false<br />
<br />

<pre><code class="code-1 nolinks" id="code-20-35758049-1"><span>Double.NaN &gt; 1.0  -&gt;  false</span>
<span>Double.NaN &lt; 1.0  -&gt;  false</span>
<span>Double.NaN == 1.0  -&gt;  false</span>
<span>Float.NaN &lt; -3.0  -&gt;  false</span>
<span>Float.NaN &gt; Float.POSITIVE_INFINITY  -&gt;  false</span>
<span>Float.NaN &lt; Float.POSITIVE_INFINITY  -&gt;  false</span>
<span>(0.0 / 0.0) == (0.0 / 0.0)  -&gt;  false</span>
</code></pre>
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I would say that since it is 'undefined', it can't be equal to or compared to anything. &nbsp;There is nothing valid to support the comparison.
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Sure, that seems also quite reasonable explanation.
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The JLS defines NaN ss *unordered* so all comparison operators return false (you cannot compare something that has no order).<br />

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<div class="content wysiwyg-content">
I am taking a java mock exam in my exam simulator - enthuware. I am studying for a certification exam. I have approached this problem about &quot;NaN&quot;, which I am not familiar with.<br />
<br />
The Question is:<br />
<br />

<div class="indent">
Which of the following statements about NaNs are true ?<br />
A. Float.NaN == Float.NaN<br />
B. Float.NaN == Double.NaN<br />
C. Float.NaN &gt;= 0<br />
D. Float.NaN &lt;&nbsp;0<br />
E. None of the above.
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<br />
<b>Here, Option E is the correct answer according to the exam simulator.</b><br />
<br />
Since NaN means &quot;Not a Number&quot;, it is obvious that C and D are incorrect. <u>But I need to know why option A is not correct in this problem?</u>
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I am taking a java mock exam in my exam simulator - enthuware. I am studying for a certification exam. I have approached this problem about "NaN", which I am not familiar with.

The Question is:

Which of the following statements about NaNs are true ?
A. Float.NaN == Float.NaN
B. Float.NaN == Double.NaN
C. Float.NaN >= 0
D. Float.NaN < 0
E. None of the above.

Here, Option E is the correct answer according to the exam simulator.

Since NaN means "Not a Number", it is obvious that C and D are incorrect. But I need to know why option A is not correct in this problem?

&quot;NaN&quot; in Java

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

&quot;NaN&quot; in Java

"NaN" in Java