**`is_alpha(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_alpha` function checks whether its argument is an ASCII letter *(A...Z, a...z)* character or not. 



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

* `c` is the character to test.

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## Return value

The function returns a logical value. 

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

What is is_alpha(c) in Fortran?

Syntax

Parameters

Return value