C++ <cmath> - atanh() Function

The C++ <cmath> atanh() function returns inverse hyperbolic tangent of a value. The inverse hyperbolic tangent of x is defined as:

Syntax

C++11

double atanh (double x);
float atanh (float x);
long double atanh (long double x);
double atanh (T x);

Parameters

`x`	Specify the value in range [-1, 1].

Return Value

Returns the inverse hyperbolic tangent of a value.
If the x is not in the range of [-1, 1], domain error occurs.
If the x is -1 or 1, pole error may occur.

Example:

In the example below, atanh() function is used to find out the inverse hyperbolic tangent of a value.

#include <iostream>
#include <cmath>
using namespace std;
 
int main () {
  cout<<atanh(0.1)<<"\n";
  cout<<atanh(0.5)<<"\n";
  cout<<atanh(2)<<"\n";
  return 0;
}

The output of the above code will be:

0.100335
0.549306
-nan

❮ C++ <cmath> Library