[user02@FC4 Lesson13]$ cat -n globloca.c

   1  #include <stdio.h>
   2
   3  int number = 1001;  // Global variable
   4  int global_number;
   5
   6  void show_numbers(int number)
   7  {
   8     printf("Local variable number contains %d\n", number);
   9     printf("Global variable number contains %d\n", global_number);
  10  }
  11
  12  int main(void)
  13  {
  14     int some_value = 2002;
  15
  16     global_number = number;
  17     show_numbers(some_value);
  18
  19     return 0;
  20  }

[user02@FC4 Lesson13]$ gcc -std=c99 -o globloca globloca.c
[user02@FC4 Lesson13]$ ./globloca
Local variable number contains 2002
Global variable number contains 1001
[user02@FC4 Lesson13]$