# tanh() function with example in C++

C++ tanh() function: Here, we are going to learn about the tanh() function with example of cmath header in C++ programming language?
Submitted by IncludeHelp, on April 28, 2019

## C++ tanh() function

tanh() function is a library function of cmath header, it is used to find the hyperbolic tangent of the given value (hyperbolic angle), it accepts a number (x) and returns the hyperbolic tangent of x.

Syntax of tanh() function:

```    tanh(x);
```

Parameter(s): x – is the number (hyperbolic angel) to be used to calculate the hyperbolic tangent.

Return value: double – it returns double type value that is the hyperbolic tangent of hyperbolic angle x.

Example:

```    Input:
float x = 2.45;

Function call:
tanh(x);

Output:
0.985217
```

### C++ code to demonstrate the example of tanh() function

```// C++ code to demonstrate the example of
// tanh() function

#include <iostream>
#include <cmath>
using namespace std;

// main() section
int main()
{
float x;

x = -10.23;
cout<<"tanh("<<x<<"): "<<tanh(x)<<endl;

x = 0;
cout<<"tanh("<<x<<"): "<<tanh(x)<<endl;

x = 2.45;
cout<<"tanh("<<x<<"): "<<tanh(x)<<endl;

return 0;
}
```

Output

```tanh(-10.23): -1
tanh(0): 0
tanh(2.45): 0.985217
```

Reference: C++ tanh() function