In the C language, the `variable's scope` refers to the part of the program where we reference it. The two types of variables in C are:

**1. Local variables** are defined *within* a function body. They are not accessible outside the function.

**2. Global variables** are defined *outside* the function body. They are accessible to the entire program. 

# Static specifier
The **`static`** specifier is one of the four standard storage classes in C. 

A **global static variable** is declared before the function declarations in a C program using the `static` keyword, as shown below:
```C
static int a = 10;
```

>The four standard storage classes in C are `static, register, auto, and extern`. 

# File scope 
The *global `static` variable* is accessible by all the functions in the same source file as the variable. This variable has a `File Scope`, i.e., we can access the variable anywhere in the same C file. Therefore, the variables with `File Scope` do not conflict with other variables because they are private to the source file.

# Example
The code below shows the `static` global variable *a*. Since *a* has a `File Scope`, it is accessible both within and outside the function. It is referenced in lines 7 and 13, as shown below:

#include <stdio.h>

// A Static Global Variable 
static int a = 20;

int func() {
  a = a + 20; 
  printf ("The value of a is: %d\n", a);
}

int main() {
  func();
  a = a + 5; 
  printf ("The value of a is: %d\n", a);
  
  return 0;
  
}

What is File Scope in C?

In the C language, the variable s scope refers to the part of the program where we reference it. The two types of variables in C are: 1. Local variables are defined within a function body. They are not accessible outside the function. 2. Global variables are defined outside the function body. They are accessible to the entire program. 