Varianti

    std::signbit

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    <metanoindex/>

     
    C++
     
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    <tbody> </tbody>
    Elemento definito nell'header <cmath>
    bool signbit( float arg );
    		 (dal C++11)
    bool signbit( double arg );
    		 (dal C++11)
    bool signbit( long double arg );
    		 (dal C++11)


    Determina se il dato floating arg punto numero è negativo.
    Original:
    Determines if the given floating point number arg is negative.
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    Parametri

    arg -
    valore in virgola mobile
    Original:
    floating point value
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    Valore di ritorno

    true arg se è negativo, altrimenti false
    Original:
    true if arg is negative, false otherwise
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    Vedi anche
    valore assoluto di un valore in virgola mobile (|x|)
    Original:
    absolute value of a floating point value (|x|)
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    (funzione) [modifica]
    (C++11)
    copia il segno di un valore in virgola mobile
    Original:
    copies the sign of a floating point value
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    (funzione) [modifica]