C++ atanh()

The atanh() function returns the inverse hyperbolic tangent of a number in radians.

Syntax

atanh(x)

This function requires an x parameter x in the range of [-1, 1]. Its data type can be double, float, or long double.

• If the value of x is outside of its range, a range error occurs.
• If x is ±1, a pole error occurs.

For C++ implementations that support floating-point math:

• If x is ±0, it is returned unmodified.
• If x is ±1, ±∞ is returned and FE_DIVBYZERO is raised.
• If |x| > 1, NaN is returned and FE_INVALID is raised.
• If x is NaN, NaN is returned.

Example

The following example uses atanh() to return the result in radians:

#include <iostream>
#include <cmath>

#define PI 3.141592654
using namespace std;

int main() {
  double x = 0.32, result;

  result = atanh(x);
  cout << "atanh(x) = " << result << " radian" << endl;

  // result in degrees
  cout << "atanh(x) = " << result*180/PI << " degree" << endl;

  return 0;
}

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This example produces the following output:

atanh(x) = 0.331647 radian
atanh(x) = 19.002 degree

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Codebyte Example

The following example is runnable:

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