acosh() function in C++ STL

The acosh() is an inbuilt function in C++ STL which returns the inverse hyperbolic cosine of an angle given in radians.

Syntax:

acosh(data_type x)

Parameter :The function accepts one mandatory parameter x which specifies the inverse hyperbolic angle in radian which should be greater or equal to 1. If the argument is less than 1, -nan is returned. The parameter can be of double, float or long double datatype.

Return : The acosh() function returns the inverse hyperbolic sine of the argument in radians which is in the range [0, inf].

Below programs illustrate the above approach:

Program 1:

// C++ program to demonstrate 
// the acosh() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    double x = 50.0; 
  
    // Function call to calculate acosh(x) value 
    double result = acosh(x); 
  
    cout << "acosh(50.0) = " << result << " radians" << endl; 
    cout << "acosh(50.0) = " << result * 180 / 3.141592 
         << " degrees" << endl; 
    return 0; 
} 

/div>

Output:

acosh(50.0) = 4.60507 radians
acosh(50.0) = 263.851 degrees

Program 2:

// C++ program to demonstrate 
// the acosh() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    int x = 40.0; 
  
    // Function call to calculate acosh(x) value 
    double result = acosh(x); 
  
    cout << "acosh(40.0) = " << result << " radians" << endl; 
    cout << "acosh(40.0) = " << result * 180 / 3.141592 
         << " degrees" << endl; 
    return 0; 
} 

Output:

acosh(40.0) = 4.38187 radians
acosh(40.0) = 251.063 degrees

Errors and Exceptions: The function returns no matching function for call to error when a string or a character is passed as an argument.

Program 3:

// C++ program to demonstrate 
// the acosh() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    string x = "gfg"; 
  
    // Function call to calculate acosh(x) value 
    double result = acosh(x); 
  
    cout << "acosh(50.0) = " << result << " radians" << endl; 
    cout << "acosh(50.0) = " << result * 180 / 3.141592 
         << " degrees" << endl; 
    return 0; 
} 

Output:

prog.cpp:11:25: error: no matching function for call to 'acosh(std::__cxx11::string&)'
  double result = acosh(x);

Program 4:

// C++ program to demonstrate 
// the acosh() function 
// value less than 1 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    double x = -50.0; 
  
    // Function call to calculate acosh(x) value 
    double result = acosh(x); 
  
    cout << "acosh(-50.0) = " << result << " radians" << endl; 
    cout << "acosh(-50.0) = " << result * 180 / 3.141592 
         << " degrees" << endl; 
    return 0; 
} 

Output:

acosh(-50.0) = -nan radians
acosh(-50.0) = -nan degrees

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