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    std::rint, std::lrint, std::llrint

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    C++
     
    Numerik-Bibliothek
    Gemeinsame mathematischen Funktionen
    Floating-Point-Umgebung
    Komplexe Zahlen
    Numerische Arrays
    Pseudo-Zufallszahlen
    Compile-time rationale Arithmetik(C++11)
    Generische numerische Operationen
    Original:
    Generic numeric operations
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    iota(C++11)
    accumulate
    inner_product
    adjacent_difference
    partial_sum
     
    Gemeinsame mathematischen Funktionen
    Funktionen
    Original:
    Functions
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    Grundlegende Bedienung
    Original:
    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)
    Exponentialfunktionen
    Original:
    Exponential functions
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    exp
    exp2(C++11)
    expm1(C++11)
    log
    log10
    log1p(C++11)
    log2(C++11)
    Power-Funktionen
    Original:
    Power functions
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    sqrt
    cbrt(C++11)
    hypot(C++11)
    pow
    Trigonometrische und hyperbolische Funktionen
    Original:
    Trigonometric and hyperbolic functions
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    sinh
    cosh
    tanh
    asinh(C++11)
    acosh(C++11)
    atanh(C++11)
    Fehler-und Gamma-Funktionen
    Original:
    Error and gamma functions
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    erf(C++11)
    erfc(C++11)
    lgamma(C++11)
    tgamma(C++11)
    Nächste ganze Zahl Fließkomma-Operationen
    Original:
    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-Point-Manipulation Funktionen
    Original:
    Floating point manipulation functions
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    ldexp
    scalbn
    scalbln    		(C++11)
    (C++11)
    ilogb(C++11)
    logb(C++11)
    Klassifizierung / Vergleich
    Original:
    Classification/Comparison
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    fpclassify(C++11)
    isfinite(C++11)
    isinf(C++11)
    isnan(C++11)
    isnormal(C++11)
    signbit(C++11)
    Makro Konstanten
    Original:
    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)
     
    definiert in Header <cmath>
    int rint(float arg );
    		(seit C++11)
    int rint(double arg );
    		(seit C++11)
    int rint(longdouble arg );
    		(seit C++11)
    int rint( Integral arg );
    		(seit C++11)
    long lrint(float arg );
    		(seit C++11)
    long lrint(double arg );
    		(seit C++11)
    long lrint(longdouble arg );
    		(seit C++11)
    long lrint( Integral arg );
    		(seit C++11)
    longlong llrint(float arg );
    		(seit C++11)
    longlong llrint(double arg );
    		(seit C++11)
    longlong llrint(longdouble arg );
    		(seit C++11)
    longlong llrint( Integral arg );
    		(seit C++11)
    Rundet die Floating-Point-Argument arg auf einen ganzzahligen Wert in Floating-Point-Format, mit dem aktuellen Rundung Modus. Wenn das Ergebnis unterscheidet sich von arg (dh arg war kein ganzzahliger Wert schon), wird die Gleitkomma-Ausnahme FE_INEXACT angehoben .
    Original:
    Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode. If the result differs from arg (i.e., arg was not an integer value already), the floating-point exception FE_INEXACT is raised.
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    Inhaltsverzeichnis

    [Bearbeiten]Parameter

    arg -
    Floating-Point-Wert
    Original:
    floating point value
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    [Bearbeiten]Rückgabewert

    Das ganzzahlige Ergebnis der Rundung arg
    Original:
    The integer result of rounding arg
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    [Bearbeiten]Notes

    Der einzige Unterschied zwischen std::nearbyint und std::rint ist, dass std::rint kann die FE_INEXACT Gleitkomma-Ausnahme zu erhöhen, während std::nearbyint wirft es nie .
    Original:
    The only difference between std::nearbyint and std::rint is that std::rint may raise the FE_INEXACT floating-point exception, while std::nearbyint never raises it.
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    [Bearbeiten]Beispiel

    #include <cmath>#include <cfenv>#include <iostream>int main(){#pragma STDC FENV_ACCESS ONstd::fesetround(FE_DOWNWARD);std::cout<<"rounding using FE_DOWNWARD:\n"<<std::fixed<<" 12.0 -> "<< std::rint(12.0)<<'\n'<<" 12.1 -> "<< std::rint(12.1)<<'\n'<<"-12.1 -> "<< std::rint(-12.1)<<'\n'<<" 12.5 -> "<< std::rint(12.5)<<'\n'<<" 12.9 -> "<< std::rint(12.9)<<'\n'<<"-12.9 -> "<< std::rint(-12.9)<<'\n'<<" 13.0 -> "<< std::rint(13.0)<<'\n';std::fesetround(FE_TONEAREST);std::cout<<"rounding using FE_TONEAREST: \n"<<" 12.0 -> "<< std::rint(12.0)<<'\n'<<" 12.1 -> "<< std::rint(12.1)<<'\n'<<"-12.1 -> "<< std::rint(-12.1)<<'\n'<<" 12.5 -> "<< std::rint(12.5)<<'\n'<<" 12.9 -> "<< std::rint(12.9)<<'\n'<<"-12.9 -> "<< std::rint(-12.9)<<'\n'<<" 13.0 -> "<< std::rint(13.0)<<'\n';   std::cout<<"When rounding 12.0 ";std::feclearexcept(FE_ALL_EXCEPT); std::rint(12.0);if(std::fetestexcept(FE_ALL_EXCEPT)&FE_INEXACT){std::cout<<"inexact result reported\n";}else{std::cout<<"inexact result not reported\n";}   std::cout<<"When rounding 12.1 "; std::rint(12.1);if(std::fetestexcept(FE_ALL_EXCEPT)&FE_INEXACT){std::cout<<"inexact result reported\n";}else{std::cout<<"inexact result not reported\n";}}

    Output: 

    rounding using FE_DOWNWARD: 12.0 -> 12.000000 12.1 -> 12.000000 -12.1 -> -13.000000 12.5 -> 12.000000 12.9 -> 12.000000 -12.9 -> -13.000000 13.0 -> 13.000000 rounding using FE_TONEAREST: 12.0 -> 12.000000 12.1 -> 12.000000 -12.1 -> -12.000000 12.5 -> 12.000000 12.9 -> 13.000000 -12.9 -> -13.000000 13.0 -> 13.000000 When rounding 12.0 inexact result not reported When rounding 12.1 inexact result reported

    [Bearbeiten]Siehe auch

    (C++11)
    nächste ganze Zahl mit aktuellen Rundung Modus
    Original:
    nearest integer using current rounding mode
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    (Funktion)[edit]
    (C++11)
    nächste Ganzzahl nicht betragsmäßig größer als der gegebene Wert
    Original:
    nearest integer not greater in magnitude than the given value
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    (Funktion)[edit]
    (C++11)
    (C++11)
    ab oder legt Rundung Richtung
    Original:
    gets or sets rounding direction
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    (Funktion)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/numeric/math/rint&oldid=29766“
    close