[#BloombergLP-bdlb-Float-isNan-06]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/Float.adoc[Float]::isNan
:relfileprefix: ../../../
:mrdocs:

`isNan` overloads

== Synopses

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

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;


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
xref:BloombergLP/bdlb/Float/isNan-0c.adoc[isNan](double number);
----

[.small]#xref:BloombergLP/bdlb/Float/isNan-0c.adoc[_» more&period;&period;&period;_]#

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;


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
xref:BloombergLP/bdlb/Float/isNan-04.adoc[isNan](float number);
----

[.small]#xref:BloombergLP/bdlb/Float/isNan-04.adoc[_» more&period;&period;&period;_]#


[.small]#Created with https://www.mrdocs.com[MrDocs]#
