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std::isnan – cppreference.com

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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

kategorisiert den angegebenen Gleitkommawert

Original:

categorizes the given floating point value

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(Funktion) [edit]

(C++11)

prüft, ob die angegebene Zahl hat endlichen Wert

Original:

checks if the given number has finite value

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(C++11)

prüft, ob die angegebene Zahl unendlich ist

Original:

checks if the given number is infinite

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(Funktion) [edit]

(C++11)

prüft, ob die gegebene Anzahl normal ist

Original:

checks if the given number is normal

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(Funktion) [edit]

prüft, ob zwei Fließkommazahlen ungeordnete werden

Original:

checks if two floating-point values are unordered

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(Funktion) [edit]