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#define NAN /*implementation defined*/
 ( C++11)
NAN float - (QNaN) . QNaNs, .
:
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.
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[static]
 NaN
(public static - std::numeric_limits) []
(C++11)
 , NaN
() []
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