Stuff

#include <iostream>

using namespace std;

int n = 5;

int main()
{
  
  int n = 10;
  
  {
    
    int n = 30;
    
    cout << "n=" << n << endl;
    
  }
  
  cout << "n=" << n << endl;
  
  cout << "::n=" << ::n << endl;
  
  return 0;
}