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NAN

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Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <cmath>
</td>

<td></td> <td></td> <tr class="t-dcl ">

<td >
#define NAN /*implementation defined*/
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

The macro NAN expands to constant expression of type float which evaluates to a quiet not-a-number (QNaN) value. If the implementation does not support QNaNs, this macro constant is not defined.

See also

Template:cpp/numeric/math/dcl list isnan
[static]
returns a quiet NaN value of the given floating-point type
(public static member function of std::numeric_limits) [edit]