std::ceil

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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 起）
计算最接近的整数不小于arg.
Original:
Computes nearest integer not less than arg.
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目录

[编辑] 参数

arg -
浮点值
Original:
floating point value
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[编辑] 返回值

最接近的整数不小于arg
Original:
Nearest integer not less than arg
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[[Image:
返回值
Original:
{{{2}}}
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|200x200px]]
Argument

[编辑] 注释

如果参数是无穷大（正或负）或0（正或负），返回值是一样的说法.
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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表示的最大浮点值是准确的整数，在所有标准的浮点格式，所以这个函数永远不会溢出.
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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此功能，但不是必需的，以，提高FE_INEXACT“非整数参数的浮点异常.
Original:
This function may, but is not required to, raise FE_INEXACT floating-point exceptions for non-integer arguments.
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[编辑] 为例

#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

[编辑] 另请参阅
最接近的整数不大于给定值
Original:
nearest integer not greater than the given value
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（函数） [edit]
（C++11）
最接近的整数的幅值比不大于给定值
Original:
nearest integer not greater in magnitude than the given value
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（函数） [edit]
（C++11）
（C++11）
（C++11）
最接近的整数，四舍五入的距离零中途情况下
Original:
nearest integer, rounding away from zero in halfway cases
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（函数） [edit]
（C++11）
（C++11）
（C++11）
最接近的整数
的结果是不同的异常，如果使用当前的舍入模式
Original:
nearest integer using current rounding mode with
exception if the result differs
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（函数） [edit]
（C++11）
最接近的整数，使用当前的舍入模式
Original:
nearest integer using current rounding mode
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（函数） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/math/ceil&oldid=29064”