In this C++ tutorial, you will learn how to find the inverse hyperbolic tangent of a number using acosh() function of cmath, with syntax and examples.
C++ atanh()
C++ atanh() returns arc (inverse) hyperbolic tangent of a number in radians.
Syntax
The syntax of C++ atanh() is
atanh(x)
where
| Parameter | Description |
|---|---|
| x | A double, float, or long double value. The value of x must be in the range [-1, 1]. |
Returns
The return value depends on the type of value passed for parameter x.
The return value of atanh(x) is
- double if x is double.
- float if x is float.
- long double if x is long double.
The synopsis of atanh() function is
double atanh(double x); float atanh(float x); long double atanh(long double x); double atanh(T x); // For integral type
atanh() is a function of cmath library. Include cmath library at start of the program, if using atanh() function.
Example
In this example, we read a number from user into variable x, and find its inverse hyperbolic tangent value using atanh().
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
double x;
cout << "Enter a number : ";
cin >> x;
double result = atanh(x);
cout << "atanh(" << x << ") : " << result << " radians" << endl;
} Output
Enter a number : 0.5 atanh(0.5) : 0.549306 radians Program ended with exit code: 0
Enter a number : -1 atanh(-1) : -inf radians Program ended with exit code: 0
Enter a number : 1 atanh(1) : inf radians Program ended with exit code: 0
Enter a number : 5 atanh(5) : nan radians Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ atanh(), and how to use this function to find the inverse hyperbolic tangent of given value, with the help of examples.