**`is_lower(c)`** is a public pure function in the **`stdlib_ascii`** module: this module provides methods to manipulate and handle intrinsic character variables and constants.

The `is_lower()` function checks whether its argument is a lowercase ASCII letter (a--z) or not. 



# 
#  Syntax
```c
public pure function is_lower(c)
```
##
## Parameters

* `c` is the character to test.


## Return value

The function returns a logical value. 

>It will return `true` if the character is a lowercase ASCII letter and `false` otherwise.

## Example

The code snippet below demonstrates the use of `is_lower` in Fortran:

```C
#include <stdlib.h>
answer = is_lower('b');
print *, answer
```

When the code above is run, the result will be as shown below:

```C
true
```


What is is_lower(c) in Fortran?

is_lower(c) checks if an argument is a lowercase ASCII letter (a-z), returning true or false.