Differentiate between global and static variable?

Global variables always have an external storage scope. Thus global variables can be accessed from other modules using 'extern' keyword.

Static variables have a local scope and can never be accessed from outside. A static variable has a file scope when declared outside the functions in a program and function scope when declared inside a function (including main function). Example:

Sample.c

static int static_1;/*File Scope*/

int add_user(char *username)
{
  static int user_count = 0;/*Function scope*/
}

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