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

Return `true` if `number` is a quiet NaN.

== Synopsis

Declared in `<bdlb_float.h>`

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

== Description

An indeterminate floating‐point value ("quiet NaN" or "QNaN") results from an operation for which the result is not mathematically defined, such as multiplying infinity by zero. If a QNaN is used in a subsequent operations the result will also be a QNaN. Note that, because a QNaN is a NaN, if this method returns `true`, then `isNan(x)` will also return `true`.

== Return Value

`true` if `number` is a quiet NaN, and `false` otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *number*
| floating‐point value to test
|===


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