Varianti

    nan, nanf, nanl

    Da cppreference.com.
    < c | numeric | math

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    <metanoindex/>

     
    C
     
    Numeri
     
    Comuni funzioni matematiche
    Funzioni
    Original:
    Functions
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    Operazioni di base
    Original:
    Basic operations
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    remainder(C99)
    remquo(C99)
    fma(C99)
    fmax(C99)
    fmin(C99)
    fdim(C99)
    nan
    nanf
    nanl    		(C99)
    (C99)
    (C99)
    Funzioni esponenziali
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    Exponential functions
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    exp
    exp2(C99)
    expm1(C99)
    log
    log10
    log1p(C99)
    log2(C99)
    Funzioni di risparmio energia
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    Power functions
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    sqrt
    cbrt(C99)
    hypot(C99)
    pow
    Funzioni trigonometriche e iperboliche
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    Trigonometric and hyperbolic functions
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    sinh
    cosh
    tanh
    asinh(C99)
    acosh(C99)
    atanh(C99)
    Errore e gamma funzioni
    Original:
    Error and gamma functions
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    erf(C99)
    erfc(C99)
    lgamma(C99)
    tgamma(C99)
    Più vicini operazioni di interi in virgola mobile
    Original:
    Nearest integer floating point operations
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    ceil
    floor
    round
    lround
    llround    		(C99)
    (C99)
    (C99)
    trunc(C99)
    nearbyint(C99)
    rint
    lrint
    llrint    		(C99)
    (C99)
    (C99)
    Floating funzioni di manipolazione di punti
    Original:
    Floating point manipulation functions
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    ldexp
    scalbn
    scalbln    		(C99)
    (C99)
    ilogb(C99)
    logb(C99)
    Classificazione
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    Classification
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    fpclassify(C99)
    isfinite(C99)
    isinf(C99)
    isnan(C99)
    isnormal(C99)
    signbit(C99)
    Macro costanti
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    Macro constants
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    <tbody> </tbody>
    Elemento definito nell'header <math.h>
    float nanf( const char* arg );
    double nan( const char* arg );
    long double nanl( const char* arg );
    Converte l'implementazione definita arg stringa di caratteri nel corrispondente valore tranquilla NaN. Il std::nan("string") chiamata è equivalente alla chiamata std::strtod("NAN(string)", (char**)NULL);.
    Original:
    Converts the implementation-defined character string arg into the corresponding quiet NaN value. The call std::nan("string") is equivalent to the call std::strtod("NAN(string)", (char**)NULL);.
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    Parametri

    arg -
    stringa di caratteri narrow identifica il contenuto di un NaN, o una stringa vuota
    Original:
    narrow character string identifying the contents of a NaN, or an empty string
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    Valore di ritorno

    Il valore NaN corrispondente alla stringa di identificazione arg o zero se il implemntation non supporta NaN tranquille.
    Original:
    The NaN value that corresponds to the identifying string arg or zero if the implemntation does not support quiet NaNs.
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    Vedi anche

    (C99)
    controlla se il numero dato è NaN
    Original:
    checks if the given number is NaN
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    (funzione) [modifica]
    C++ documentation for nan