Language Basics C++ Tutorial

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#include 
int n=0;  //Global
main()
{
        int n = 1;
        {
               int n = 2 ;
               {
                        int n = 3;
                        cout << "In inner  n=" <                        cout << "Global    n=" << ::n <               }
               cout << "In outter n=" <               cout << "Global    n=" <<::n<        }
        cout << "In main() n=" << n<        return 0 ;
}
In inner n=3
Global n=0
In outter n=2
Global n=0
In main() n=1