# asinh() function in C++ STL

### C++ STL Function : asinh()

The `asinh()` function uses a mathematical formula to calculate the inverse hyperbolic sine of a number. This formula involves the use of exponential functions and involves the ratio of the sides of a right triangle in a hyperbolic coordinate system.In this section, we will discuss about library function asinh() in STL which is used in C++.The Standard Template Library(STL) is a set of complete data structures and functions which can be used in C++. ## Library Function asinh() in C++

In C++ programming language, the asinh function is included in standard template library.

The range of input argument which is passed to floor function is not limited here as it can be any value such as float or long double also.

### Declaration of asinh function

```asinh(data_type x)
```

### Parameters of asinh function

The asinh function accepts a single input argument  which is the hyperbolic angle and can be a double/float or long double value.

Parameter           Description
Hyperbolic angle          This value of the parameter can be of double / float /int or long double type.

### Return value of asinh function

The asinh function returns the inverse hyperbolic sine value of the argument passed.

ParameterReturn Value
Inverse hyperbolic sine of the argument passedIt returns the value in double / float / int or long double type.

### Implementation of STL Function asinh() in C++

#### Example 1:

The following code shows the use of asinh function.

Run

```#include<bits/stdc++.h>
using namespace std;
int main()
{
int x = -50.0;
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:

Run

```#include<bits/stdc++.h>
using namespace std;
int main()
{
string x = "mno";
double result = asinh(x);
cout << "asinh(50.0) = " << result << " radians"<< endl;
cout << "asinh(50.0) = " << result * 180 / 3.141592<< " degrees" << endl;
return 0;
}
```

#### Output:

```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);
```

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