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

The `is_alphanum` function checks whether its argument is a letter *(a...z, A...Z)* or a number *(0...9)*. 



# 
#  Syntax
```c
public pure function is_alphanum(c)
```
##
## Function parameter(s)

`c` is the character to test.


## Return value

This function returns a logical value. 

>It will return `true` if the character is an alphanumeric character and `false` otherwise.

What is is_alphanum(c) in Fortran?

is_alphanum(c) from the stdlib_ascii module checks if a character is alphanumeric.