The **`logl`** function calculates the natural logarithm ($log_e$  or $ln$) of the argument passed, when the argument is of the `long double` type.


# Standard Library
```c
#include<math.h>
```

# Syntax
```c
long double logl( long double number );
```

# Parameters
`number`: A `long double` value.

# Return Value
If no errors occur, $ln \space number$ is returned.
>If a negative number is passed as an argument, an error occurs.

# Code



#include <math.h>
#include <stdio.h>
int main()
{
   long double result;
   long double number;
   number = 10.2;
   result = logl(number);
   printf("The natural log of %Lf is %Lf\n", number, result); // %Lf is the string formatter for long double
   return 0;
}

What is logl in C?

Calculates the natural logarithm of a long double; errors occur with negative numbers.