[#BloombergLP-bdlb-Float-isNan-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/Float.adoc[Float]::isNan
:relfileprefix: ../../../
:mrdocs:

Return `true` if the specified floating point `number` has a value that does not represent a real number (&quot;not&hyphen;a&hyphen;number&quot; or &quot;NaN&quot;), and `false` otherwise&period; This function is equivalent to the `isnan` macro in C99&period; Note that if this method returns `true`, then either `isQuietNan` or `isSignalingNan` will also return `true`&period;

== Synopsis

Declared in `&lt;bdlb&lowbar;float&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
isNan(float number);
----


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