# asinh() function in C++ STL

• Last Updated : 29 Nov, 2021

The asinh() is an inbuilt function in C++ STL that returns the inverse hyperbolic sine of an angle given in radians. The function belongs to <cmath> header file.

Syntax:

`asinh(data_type x)`

Parameter: The function accepts one mandatory parameter x which specifies the inverse hyperbolic angle in radian. It can be any value i.e. negative, positive, or zero. The parameter can be of double, float, or long double datatype.

Return Value: This function returns the inverse hyperbolic sine of the argument in radians.

According to C++ 11 standard, there are various prototypes available for asinh() function:

Here, val is the variable.

Example 1:

## CPP

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

Output

```asinh(50.0) = 4.60527 radians
asinh(50.0) = 263.863 degrees```

Example 2:

## CPP

 `// C++ program to demonstrate``// the asinh() function``#include ``using` `namespace` `std;` `// Driver Code``int` `main()``{``    ``int` `x = -50.0;` `    ``// Function call to calculate asinh(x) value``    ``double` `result = asinh(x);` `    ``cout << ``"asinh(-50.0) = "` `<< result << ``" radians"``         ``<< endl;``    ``cout << ``"asinh(-50.0) = "` `<< result * 180 / 3.141592``         ``<< ``" degrees"` `<< endl;``    ``return` `0;``}`

Output

```asinh(-50.0) = -4.60527 radians
asinh(-50.0) = -263.863 degrees```

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

Example:

## CPP

 `// C++ program to demonstrate errors in``// the asinh() function``#include ``using` `namespace` `std;` `// Driver Code``int` `main()``{``    ``string x = ``"gfg"``;` `    ``// Function call to calculate asinh(x) value``    ``double` `result = asinh(x);` `    ``cout << ``"asinh(50.0) = "` `<< result << ``" radians"``         ``<< endl;``    ``cout << ``"asinh(50.0) = "` `<< result * 180 / 3.141592``         ``<< ``" degrees"` `<< endl;``    ``return` `0;``}`

Error:

```prog.cpp: In function ‘int main()’:
prog.cpp:12:28: error: no matching function for call to ‘asinh(std::__cxx11::string&)’
double result = asinh(x);```

The above program generates an error of no matching function for call as a string is passed as an argument.