---
title: pow2o3
description: "计算x的2/3次幂。"
url: https://www.hikunpeng.com/document/detail/zh/kunpenghpcs/hpckit/devg/kunpengaccel_kml_0200.html
sourcePath: /source/zh/kunpenghpcs/hpckit/devg/kunpengaccel_kml_0200.html
indexId: 567725edfd8408647a41cfd5c6a212f2f523b573e4bed40d9503cfb946bcb19161
---
# 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 handling
    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
     * */
```