**`is_hex_digit(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_hex_digit` function checks whether its argument is a digit in base 16 *(0...9, A...F, a...f)* or not. 



# 
#  Syntax
```c
public pure function is_hex_digit(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 hexadecimal digit and `false` otherwise.

What is is_hex_digit(c) in Fortran?

is_hex_digit(c) is a public pure function in Fortran's stdlib_ascii module that checks if a character is a hexadecimal digit, returning true or false.