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bool isnan( float arg );
 ( C++11)
bool isnan( double arg );
 ( C++11)
bool isnan( long double arg );
 ( C++11)
, arg - (NaN).
:
Determines if the given floating point number arg is not-a-number (NaN).
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arg
:
floating point value
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true arg NaN, false
:
true if arg is NaN, false otherwise
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