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在头文件<math.h>中定义



float tanhf（float arg）;

(1)

（自C99以来）

double tanh（double arg）;

(2)


long double tanhl（long double arg）;

(3)

（自C99以来）

在头文件<tgmath.h>中定义



#define tanh（arg）

(4)

（自C99以来）

1-3）计算arg的双曲正切。

4）类型 - 泛型宏：如果参数的类型为long double，则调用tanhl。 否则，如果参数具有整数类型或类型double，则调用tanh。 否则，调用tanhf。 如果参数很复杂，那么宏调用相应的复合函数（ctanhf，ctanh，ctanhl）。

参数

arg

-

floating point value representing a hyperbolic angle

返回值

如果没有错误发生，则返回arg（tanh（arg）或者双曲正切

| earg-e-arg |

|:----|

| earg+e-arg |

）被返回。

如果由于下溢而发生范围错误，则返回正确的结果（舍入后）。

错误处理

按照math_errhandling中的指定报告错误。

如果实现支持IEEE浮点运算（IEC 60559），

  • 如果参数为±0，则返回±0

  • 如果参数为±∞，则返回±1

  • 如果参数是NaN，则返回NaN

注意

POSIX指定在发生下溢时，arg未经修改就返回，如果不支持，则返回不大于DBL_MIN，FLT_MIN和LDBL_MIN的实现定义值。

例

#include <stdio.h>#include <math.h>
 int main(void){    printf("tanh(1) = %f\ntanh(-1) = %f\n", tanh(1), tanh(-1));    printf("tanh(0.1)*sinh(0.2)-cosh(0.2) = %f\n", tanh(0.1) * sinh(0.2) - cosh(0.2));    // special values    printf("tanh(+0) = %f\ntanh(-0) = %f\n", tanh(0.0), tanh(-0.0));}

输出：

tanh(1) = 0.761594tanh(-1) = -0.761594tanh(0.1)*sinh(0.2)-cosh(0.2) = -1.000000tanh(+0) = 0.000000tanh(-0) = -0.000000

参考

  • C11标准（ISO / IEC 9899：2011）：

    • 7.12.5.6 tanh函数（p：242）

    • 7.25类型通用数学<tgmath.h>（p：373-375）

    • F.10.2.6 tanh函数（p：520）

  • C99标准（ISO / IEC 9899：1999）：

    • 7.12.5.6 tanh函数（p：222-223）

    • 7.22类型通用数学<tgmath.h>（p：335-337）

    • F.9.2.6 tanh函数（p：457）

  • C89 / C90标准（ISO / IEC 9899：1990）：

    • 4.5.3.3 tanh函数

扩展内容

sinhsinhfsinhl（C99）（C99）

计算双曲正弦函数（sh（x））（函数）

coshcoshfcoshl（C99）（C99）

计算双曲余弦（ch（x））（函数）

atanhatanhfatanhl（C99）（C99）（C99）

计算反双曲正切（artanh（x））（函数）

（C99）（C99）（C99）

计算复数双曲正切（函数）

|tanh的 C ++文档 |

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