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#include <iostream>
 
int a = 10;
namespace M
{
    int a = 20;
    namespace N
    {
           int a = 30;
           void f()
           {
              int x = a; //a refers to the name inside N, same as M::N::a
              int y = M::a; //M::a refers to the name inside M
              int z = ::a; //::a refers to the name in the global namespace
 
              std::cout << x << ", "<< y << ", " << z << std::endl; //30,20,10
           }
    }
}
int main() 
{
    M::N::f();
}

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• # 4:   hide show   clone   input   78 days 14 hours ago    Success

  result: Success     time: 0s    memory: 2896 kB     returned value: 0

  input:

  int a = 10; namespace M {     int a = 20;     namespace N     {            int a = 30;            void f()            {               int x = a; //a refers to the name inside N, same as M::N::a               int y = M::a; //M::a refers to the name inside M               int z = ::a; //::a refers to the name in the global namespace                 std::cout << x << ", "<< y << ", " << z << std::endl; //30,20,10            }     } } int main() {     M::N::f(); } - See more at: http://ideone.com/sp28n#sthash.hxnsih6z.dpuf

  output:

  30, 20, 10
  
• # 3:   hide show   clone   input   78 days 14 hours ago    Success

  result: Success     time: 0s    memory: 2896 kB     returned value: 0

  input:

  int a = 30; namespace M {     int a = 20;     namespace N     {            int a = 30;            void f()            {               int x = a; //a refers to the name inside N, same as M::N::a               int y = M::a; //M::a refers to the name inside M               int z = ::a; //::a refers to the name in the global namespace                 std::cout << x << ", "<< y << ", " << z << std::endl; //30,20,10            }     } } int main() {     M::N::f(); } - See more at: http://ideone.com/sp28n#sthash.hxnsih6z.dpuf

  output:

  30, 20, 10
  
• # 2:   hide show   clone   input   88 days 2 hours ago    Success

  result: Success     time: 0s    memory: 2852 kB     returned value: 0

  input:

  #include <iostream>
   
  int a = 5;
  namespace M
  {
      int a = 20;
      namespace N
      {
             int a = 30;
             void f()
             {
                int x = a; //a refers to the name inside N, same as M::N::a
                int y = M::a; //M::a refers to the name inside M
                int z = ::a; //::a refers to the name in the global namespace
   
                std::cout << x << ", "<< y << ", " << z << std::endl; //30,20,10
             }
      }
  }
  int main() 
  {
      M::N::f();
  }

  output:

  30, 20, 10
  
• # 1:   hide show   clone   input   457 days 2 hours ago    Success

  result: Success     time: 0.01s    memory: 2724 kB     returned value: 0

  input: no
  output:

  30, 20, 10