std::isnan – cppreference.com

std::isnan

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FP_NORMAL
FP_SUBNORMAL
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FP_NAN		(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
<tbody> </tbody>
definiert in Header <cmath>
bool isnan( float arg );
 (seit C++11)
bool isnan( double arg );
 (seit C++11)
bool isnan( long double arg );
 (seit C++11)
Bestimmt, ob die angegebene Gleitkommazahl arg ist not-a-number (NaN) .
Original:
Determines if the given floating point number arg is not-a-number (NaN).
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Parameter

arg -
Floating-Point-Wert
Original:
floating point value
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Rückgabewert

true wenn arg ist NaN, false anders
Original:
true if arg is NaN, false otherwise
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Siehe auch