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

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

# Syntax
```c
float logf( float number );
```

# Parameters
`str` - `float` 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()
{
   float result;
   float x = 10.2;
   result = logf(x);
   printf("The natural log of %f is %f\n", x, result);
   return 0;
}

What is logf in C?

Standard Library

Syntax

Parameters

Return Value

Code