---
title: pow2o3
description: "计算x的2/3次幂。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/240RC2/accel/kunpengaccel_kml_16_0383.html
sourcePath: /source/zh/kunpengboostkithistory/240RC2/accel/kunpengaccel_kml_16_0383.html
indexId: 392b78ffeca3fbdc4a69700126f0adec34c0e817426e49902a37a2d4309e112f76
---
# pow2o3

计算x的2/3次幂。

#### 接口定义

C interface：

float pow2o3f(float x);

double pow2o3(double x);


#### 参数

| 参数名 | 类型 | 描述 | 输入/输出 |
| --- | --- | --- | --- |
| x | 在pow2o3f中，x是单精度浮点类型。 在pow2o3中，x是双精度浮点类型。 | 表示输入数据的浮点值。 | 输入 |


#### 返回值

- 输入x为±0，返回+0。
- 输入x为+∞，返回+∞。
- 输入x为-∞，返回+∞。
- 输入x为nan，返回nan。


#### 依赖

C: "km.h"


#### 示例

C interface：
```
// typical usage
double x1 = 0.0, x2 = -0.0, x3 = 1.5, x4 = -2.5;
// special handing
double a = INFINITY, b = -INFINITY, c = NAN;
// print result
printf("pow2o3(0.0) = %.15f\n", pow2o3(x1));
printf("pow2o3(-0.0) = %.15f\n", pow2o3(x2));
printf("pow2o3(1.5) = %.15f\n", pow2o3(x3));
printf("pow2o3(-2.5) = %.15f\n", pow2o3(x4));
printf("pow2o3(INFINITY) = %.15f\n", pow2o3(a));
printf("pow2o3(-INFINITY) = %.15f\n", pow2o3(b));
printf("pow2o3(NAN) = %.15f\n", pow2o3(c));
/*
*  pow2o3(0.0) = 0.000000000000000
*  pow2o3(-0.0) = 0.000000000000000
*  pow2o3(1.5) = 1.310370697104448
*  pow2o3(-2.5) = 1.842015749320193
*  pow2o3(INFINITY) = inf
*  pow2o3(-INFINITY) = inf
*  pow2o3(NAN) = nan
* */
```