Usage and Example of C Library Function tanh()

C Standard Library - <math.h>

C Library Function double tanh(double x) Returns x hyperbolic tangent value.

Declaration

Below is the declaration of the tanh() function.

double tanh(double x)

Parameter

• x 　-- Floating-point value.

Return Value

This function returns the hyperbolic tangent of x.

Online Example

The following example demonstrates the usage of the tanh() function.

#include <stdio.h>
#include <math.h>
int main()
{
　　　　double x, ret;
　　　　x = 0.87;
　　　　ret = tanh(x);
　　　　printf("%lf's hyperbolic tangent is %lf degrees", x, ret);
　　　　return(0);
}

Let's compile and run the above program, which will produce the following results:

0.87The hyperbolic tangent of 0.0000 is 0.701374

C Standard Library - <math.h>