---
title: ctanh
description: "计算复数的双曲正切值。"
url: https://www.hikunpeng.com/document/detail/zh/kunpenghpcs/hpckit/devg/kunpengaccel_kml_0273.html
sourcePath: /source/zh/kunpenghpcs/hpckit/devg/kunpengaccel_kml_0273.html
indexId: 6154f8d89bef1b226a2116e31c8fd259b87b3fee448af3638bde452c14eb385561
---
# ctanh

计算复数的双曲正切值。

#### 接口定义

C interface：

float complex ctanhf(float complex x);

double complex ctanh(double complex x);


#### 参数

| 参数名 | 类型 | 描述 | 输入/输出 |
| --- | --- | --- | --- |
| x | 在ctanhf中，x是复数单精度浮点类型。 | 表示输入数据的浮点值。 | 输入 |
| x | 在ctanh中，x是复数双精度浮点类型。 | 表示输入数据的浮点值。 | 输入 |


#### 返回值

- 返回x的双曲正切结果y。
- 特殊值说明如下所示。| 输入值实部（x.real） | 输入值虚部（x.imag） | 输出值实部（y.real） | 输出值虚部（y.imag） |
| --- | --- | --- | --- |
| 0.0 | 0.0 | 0.0 | 0.0 |
| 0.0 | \-0.0 | 0.0 | \-0.0 |
| 0.0 | inf | 0.0 | nan |
| 0.0 | \-inf | 0.0 | nan |
| 0.0 | nan | 0.0 | nan |
| 0.0 | \-nan | 0.0 | nan |
| \-0.0 | 0.0 | \-0.0 | 0.0 |
| \-0.0 | \-0.0 | \-0.0 | \-0.0 |
| \-0.0 | inf | \-0.0 | nan |
| \-0.0 | \-inf | \-0.0 | nan |
| \-0.0 | nan | \-0.0 | nan |
| \-0.0 | \-nan | \-0.0 | nan |
| inf | 0.0 | 1.0 | 0.0 |
| inf | \-0.0 | 1.0 | \-0.0 |
| inf | inf | 1.0 | 0.0 |
| inf | \-inf | 1.0 | \-0.0 |
| inf | nan | 1.0 | 0.0 |
| inf | \-nan | 1.0 | \-0.0 |
| \-inf | 0.0 | \-1.0 | 0.0 |
| \-inf | \-0.0 | \-1.0 | \-0.0 |
| \-inf | inf | \-1.0 | 0.0 |
| \-inf | \-inf | \-1.0 | \-0.0 |
| \-inf | nan | \-1.0 | 0.0 |
| \-inf | \-nan | \-1.0 | \-0.0 |
| nan | 0.0 | nan | 0.0 |
| nan | \-0.0 | nan | \-0.0 |
| nan | inf | nan | nan |
| nan | \-inf | nan | nan |
| nan | nan | nan | nan |
| nan | \-nan | nan | nan |
| \-nan | 0.0 | \-nan | 0.0 |
| \-nan | \-0.0 | \-nan | \-0.0 |
| \-nan | inf | nan | nan |
| \-nan | \-inf | nan | nan |
| \-nan | nan | nan | nan |
| \-nan | \-nan | nan | nan |


#### 依赖

C: "kc.h"


#### 示例

C interface：```
// typical usage
    double x1 = INFINITY, y1 = INFINITY;
    double x2 = 2.0, y2 = 3.0;
    double x3 = -2.5, y3 = -3.4;
    double x4 = NAN, y4 = NAN;
    double x5 = 0, y5 = 0;
    double complex z1 = ctanh(__builtin_complex(x1, y1));
    double complex z2 = ctanh(__builtin_complex(x2, y2));
    double complex z3 = ctanh(__builtin_complex(x3, y3));
    double complex z4 = ctanh(__builtin_complex(x4, y4));
    double complex z5 = ctanh(__builtin_complex(x5, y5));
    // print result
    printf("/*\n");
    printf(" * ctanh(%.2f + %.2f*I) = %.6f + %.6f*I\n", x1, y1, __real__(z1), __imag__(z1));
    printf(" * ctanh(%.2f + %.2f*I) = %.6f + %.6f*I\n", x2, y2, __real__(z2), __imag__(z2));
    printf(" * ctanh(%.2f + %.2f*I) = %.6f + %.6f*I\n", x3, y3, __real__(z3), __imag__(z3));
    printf(" * ctanh(%.2f + %.2f*I) = %.6f + %.6f*I\n", x4, y4, __real__(z4), __imag__(z4));
    printf(" * ctanh(%.2f + %.2f*I) = %.6f + %.6f*I\n", x5, y5, __real__(z5), __imag__(z5));
    printf(" **/\n");
 
   /*
    * ctanh(inf + inf*I) = 1.000000 + 0.000000*I
    * ctanh(2.00 + 3.00*I) = 0.965386 + -0.009884*I
    * ctanh(-2.50 + -3.40*I) = -0.988331 + -0.006581*I
    * ctanh(nan + nan*I) = nan + nan*I
    * ctanh(0.00 + 0.00*I) = 0.000000 + 0.000000*I
    **/
```