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std::ceil

Da cppreference.com.
< cpp‎ | numeric‎ | math

 
 
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
Original:
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
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)
Funzioni esponenziali
Original:
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
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 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)
 
Defined in header <cmath>
float       ceil( float arg );
double      ceil( double arg );
long double ceil( long double arg );
double      ceil( Integral arg );
(dal C++11)
Calcola più vicino intero non inferiore a arg.
Original:
Computes nearest integer not less than arg.
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Indice

[modifica] Parametri

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

Più vicino numero intero non inferiore a arg
Original:
Nearest integer not less than arg
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[[Image:
Valore di ritorno
Original:
{{{2}}}
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|200x200px]]
Argument

[modifica] Note

Se l'argomento è infinito (positivo o negativo) o zero (positivo o negativo), il valore restituito è lo stesso come argomento.
Original:
If the argument is infinity (positive or negative) or zero (positive or negative), the return value is the same as the argument.
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Rappresentabile più grande valori a virgola mobile sono numeri esatti in tutti gli standard in virgola mobile formati, in modo da non questa funzione overflow.
Original:
The largest representable floating-point values are exact integers in all standard floating-point formats, so this function never overflows.
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Questa funzione può, ma non è tenuto a, sollevare FE_INEXACT virgola mobile eccezioni per non interi argomenti.
Original:
This function may, but is not required to, raise FE_INEXACT floating-point exceptions for non-integer arguments.
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[modifica] Esempio

#include <cmath>
#include <iostream>
 
int main()
{
    double a = 12.0;
    std::cout << std::fixed;
    std::cout << std::ceil(12.0) << '\n';
    std::cout << std::ceil(12.1) << '\n';
    std::cout << std::ceil(12.5) << '\n';
    std::cout << std::ceil(12.9) << '\n';
    std::cout << std::ceil(13.0) << '\n';}

Output:

12.000000
13.000000
13.000000
13.000000
13.000000

[modifica] Vedi anche

intero più vicino non superiore al valore dato
Original:
nearest integer not greater than the given value
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(funzione) [edit]
(C++11)
intera più vicina non superiore in grandezza rispetto al valore dato
Original:
nearest integer not greater in magnitude than the given value
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(funzione) [edit]
(C++11)
(C++11)
(C++11)
numero intero più vicino, l'arrotondamento a da zero in caso a metà strada
Original:
nearest integer, rounding away from zero in halfway cases
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(funzione) [edit]
(C++11)
(C++11)
(C++11)
numero intero più vicino utilizzando la modalità corrente di arrotondamento ad eccezione
se il risultato è diverso
Original:
nearest integer using current rounding mode with
exception if the result differs
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(funzione) [edit]
(C++11)
numero intero più vicino utilizzando la modalità corrente di arrotondamento
Original:
nearest integer using current rounding mode
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(funzione) [edit]