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    NAN

    Da cppreference.com.
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    <metanoindex/>

     
    C++
     
    Numeri libreria
    Comuni funzioni matematiche
    Virgola mobile ambiente
    I numeri complessi
    Array numerici
    Pseudo-casuale generazione
    In fase di compilazione aritmetica razionale (C++11)
    Generici operazioni numeriche
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    Generic numeric operations
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    iota(C++11)
    accumulate
    inner_product
    adjacent_difference
    partial_sum
     
    Comuni funzioni matematiche
    Funzioni
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    Functions
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    Operazioni di base
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    Basic operations
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    remainder(C++11)
    remquo(C++11)
    fma(C++11)
    fmax(C++11)
    fmin(C++11)
    fdim(C++11)
    nan
    nanf
    nanl    		(C++11)
    (C++11)
    (C++11)
    Funzioni esponenziali
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    Exponential functions
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    exp
    exp2(C++11)
    expm1(C++11)
    log
    log10
    log1p(C++11)
    log2(C++11)
    Funzioni di risparmio energia
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    Power functions
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    sqrt
    cbrt(C++11)
    hypot(C++11)
    pow
    Funzioni trigonometriche e iperboliche
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    Trigonometric and hyperbolic functions
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    sinh
    cosh
    tanh
    asinh(C++11)
    acosh(C++11)
    atanh(C++11)
    Errore e gamma funzioni
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    Error and gamma functions
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    erf(C++11)
    erfc(C++11)
    lgamma(C++11)
    tgamma(C++11)
    Più vicini operazioni di interi in virgola mobile
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    Nearest integer floating point operations
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    ceil
    floor
    round
    lround
    llround    		(C++11)
    (C++11)
    (C++11)
    trunc(C++11)
    nearbyint(C++11)
    rint
    lrint
    llrint    		(C++11)
    (C++11)
    (C++11)
    Floating funzioni di manipolazione di punti
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    Floating point manipulation functions
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    ldexp
    scalbn
    scalbln    		(C++11)
    (C++11)
    ilogb(C++11)
    logb(C++11)
    frexp
    modf
    nextafter
    nexttoward    		(C++11)
    (C++11)
    copysign(C++11)
    Classificazione / confronto
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    Classification/Comparison
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    fpclassify(C++11)
    isfinite(C++11)
    isinf(C++11)
    isnan(C++11)
    isnormal(C++11)
    signbit(C++11)
    isgreater(C++11)
    isgreaterequal(C++11)
    isless(C++11)
    islessequal(C++11)
    islessgreater(C++11)
    isunordered(C++11)
    Macro costanti
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    Macro constants
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    FP_NORMAL
    FP_SUBNORMAL
    FP_ZERO
    FP_INFINITE
    FP_NAN    		(C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
     
    <tbody> </tbody>
    Elemento definito nell'header <cmath>
    #define NAN /*implementation defined*/
    		 (dal C++11)
    Il NAN macro restituisce un'espressione costante di float tipo che restituisce una tranquilla not-a-number (QNAN) valore. Se l'applicazione non supporta QNaNs, questa costante macro non è definita.
    Original:
    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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    Vedi anche

    [statico]
    restituisce un valore NaN tranquilla di un dato tipo a virgola mobile
    Original:
    returns a quiet NaN value of the given floating-point type
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    (metodo pubblico statico) [modifica]
    (C++11)
    controlla se il numero dato è NaN
    Original:
    checks if the given number is NaN
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    (funzione) [modifica]