The **` log` function** is a C library function that returns the natural logarithm of an argument. 

To use the `log` function, the `math` header file needs to be included in the program, as follows:

```C
#include <math.h>
```


# Parameters
The `log` function takes a single argument of the `floating-point` type and computes its logarithm to the base of `e`.  

# Return Value 
If the argument is greater than zero, the `log` function returns the natural logarithm of the argument in the `float` type. 

* If the argument is 0, a range error is returned 

* If the argument is less than zero, a domain error is returned

# Example
The following code explains the use of `log` function in C:

#include <stdio.h>
#include <math.h>

int main() {

  //Define argument 'x'
  double x = 5.1;

  //Compute the Log 
  double answer;
  answer = log(x);
  
  //Display the result 
  printf ("The Log of %f is %f", x, answer);

  return 0;
}

What is log() in C?

Parameters

Return Value

Example