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std::cbrt

性病：CBRT

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

的立方根。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-value of a floating-point or Integral type

返回值

如果没有发生错误，则arg返回%283拉丁语Arg%29。

如果由于下流而发生范围错误，则返回舍入%29后的正确结果%28。

错误处理

错误按math_errhandling...

如果实现支持ieee浮点算法%28IEC 60559%29，

  • 如果参数为±0或±∞，则返回不变。

  • 如果论点是NaN，则返回NaN。

注记

std::cbrt(arg)不等于std::pow(arg, 1.0/3)因为std::pow不能将负基提高到小数指数。

例

二次

#include <iostream>
#include <cmath>
 
int main()
{
    // normal use
    std::cout << "cbrt(729) = " << std::cbrt(729) << '\n'
              << "cbrt(-0.125) = " << std::cbrt(-0.125) << '\n';
    // special values
    std::cout << "cbrt(-0) = " << std::cbrt(-0.0) << '\n'
              << "cbrt(+inf) = " << std::cbrt(INFINITY) << '\n';
}

二次

产出：

二次

cbrt(729) = 9
cbrt(-0.125) = -0.5
cbrt(-0) = -0
cbrt(+inf) = inf

二次

另见

powraises a number to the given power (xy) (function)
sqrtcomputes square root (√x) (function)
hypot (C++11)computes square root of the sum of the squares of two given numbers (√x2+y2) (function)

c CBRT文件

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