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std::floor

STD：地板

Defined in header ​​
float floor( float arg (1)​
double floor( double arg (2)​
long double floor( long double arg (3)​
double floor( Integral arg (4)(since C++11)

1-3%29计算的最大整数值不大于arg...

4%29一组过载或接受任意参数的函数模板积分型等于2%29%28double29%。

参数

arg-floating point value

返回值

如果没有发生错误，则最大整数值不大于arg，那就是阿格，也是回的。

返回值

二次

二次

论辩

错误处理

错误按数学[医]错误处理...

如果实现支持ieee浮点算法%28IEC 60559%29，

  • 电流舍入方式没有效果。

  • 如果arg是±∞，它被返回，未经修改

  • 如果arg是±0，它被返回，未经修改

  • 如果阿格是南，南就会被归还。

注记

FE_INEXACT可能为%28，但在舍入非整数有限值时，%27T是否需要提高%29。

最大的可表示浮点值是所有标准浮点格式的精确整数，因此此函数本身不会溢出，但是结果可能会溢出任何整数类型%28，包括std::intmax_t%29，存储在整数变量中。

例

二次

#include <cmath>
#include <iostream>
int main()
{
    std::cout << std::fixed
              << "floor(+2.7) = " << std::floor(+2.7) << '\n'
              << "floor(-2.7) = " << std::floor(-2.7) << '\n'
              << "floor(-0.0) = " << std::floor(-0.0) << '\n'
              << "floor(-Inf) = " << std::floor(-INFINITY) << '\n';
}

二次

产出：

二次

floor(+2.7) = 2.000000
floor(-2.7) = -3.000000
floor(-0.0) = -0.000000
floor(-Inf) = -inf

二次

另见

ceilnearest integer not less than the given value (function)
trunc (C++11)nearest integer not greater in magnitude than the given value (function)
roundlroundllround (C++11)(C++11)(C++11)nearest integer, rounding away from zero in halfway cases (function)

c地板文件

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