A namespace can be nested within another : NameSpace « Language « C++

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C++ » Language » NameSpace Screenshots  A namespace can be nested within another   #include <iostream> using namespace std; namespace MyNameSpace1 {   int i;   namespace MyNameSpace2 { // a nested namespace     int j;   } } int main() {   MyNameSpace1::i = 19;   MyNameSpace1::MyNameSpace2::j = 10;   cout << MyNameSpace1::i << " "<<  MyNameSpace1::MyNameSpace2::j << "\n";   using namespace MyNameSpace1;   cout << i * MyNameSpace2::j;   return 0; }                          Related examples in the same category 1. Namespace Demo: define a namespace 2. Namespaces are additive 3. Demonstrate a namespace 4. Some Namespace Options 5. use explicit std:: qualification. 6. Using namespace to reference variables 7. Namespace code section 8. Use namespaces to wrap variables 9. Enclosure variables with namespace 10. Defines and tests namespaces.