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

   1  #include <iostream>
   2  using namespace std;
   3
   4  int number = 1001;  // Global variable

   5
   6  void show_numbers(int number)
   7  {
   8     cout << "Local variable number contains " << number << endl;
   9     cout << "Global variable number contains " << ::number << endl;
  10  }
  11
  12  int main()
  13  {
  14     int some_value = 2002;
  15
  16     show_numbers(some_value);
  17
  18     return 0;
  19  }

[user02@FC4 Lesson13]$ g++ -o globloca globloca.cpp
[user02@FC4 Lesson13]$ ./globloca
Local variable number contains 2002
Global variable number contains 1001
[user02@FC4 Lesson13]$