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std::ceil

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< cpp‎ | numeric‎ | math

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C++
 
ニューメリックスライブラリ
一般的な数学関数
浮動小数点環境
複素数
数値配列
擬似乱数生成
コンパイル時有理数演算 (C++11)
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Generic numeric operations
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iota(C++11)
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一般的な数学関数
機能します
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基本操作
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Basic operations
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fmax(C++11)
fmin(C++11)
fdim(C++11)
nan
nanf
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指数関数
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Exponential functions
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exp
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最も近い整数の浮動小数点演算
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Nearest integer floating point operations
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ceil
floor
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trunc(C++11)
nearbyint(C++11)
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Floating point manipulation functions
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Defined in header <cmath>
float       ceil( float arg );
double      ceil( double arg );
long double ceil( long double arg );
double      ceil( Integral arg );
 (C++11およびそれ以降)
arg未満でない最も近い整数を計算.
Original:
Computes nearest integer not less than arg.
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目次

[編集] パラメータ

arg -
浮動小数点値
Original:
floating point value
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[編集] 値を返します

arg未満でない最も近い整数
Original:
Nearest integer not less than arg
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[[Image:
値を返します
Original:
{{{2}}}
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|200x200px]]
Argument

[編集] ノート

引数が無限大（正または負）かゼロ（正または負）である場合、戻り値は引数と同じです.
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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最大の表現可能な浮動小数点値は、この関数を決してあふれないように、すべての標準的な浮動小数点形式での正確な整数である.
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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この関数は、必ずしも要求されない場合があり、非整数の引数の浮動小数点例外をFE_INEXACT上げる.
Original:
This function may, but is not required to, raise FE_INEXACT floating-point exceptions for non-integer arguments.
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[編集] 例

このコードを実行します
#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';}

出力: 

12.000000
13.000000
13.000000
13.000000
13.000000

[編集] 参照
最も近い整数ではありません指定された値より大きい
Original:
nearest integer not greater than the given value
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(関数) [edit]
(C++11)
与えられた値よりも大きさが大きくない最も近い整数
Original:
nearest integer not greater in magnitude than the given value
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(関数) [edit]
(C++11)
(C++11)
(C++11)
最も近い整数値、中間値の場合でゼロから離れる丸め
Original:
nearest integer, rounding away from zero in halfway cases
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(関数) [edit]
(C++11)
(C++11)
(C++11)
結果が異なる場合
を除いて、現在の丸めモードを使用して、最も近い整数
Original:
nearest integer using current rounding mode with
exception if the result differs
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(関数) [edit]
(C++11)
現在の丸めモードを使用して、最も近い整数
Original:
nearest integer using current rounding mode
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(関数) [edit]
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