Namespaces are additive : NameSpace « Language « C++

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C++ » Language » NameSpace Screenshots  Namespaces are additive   #include <iostream> using namespace std; namespace Demo {            // In Demo namespace   int a;  } int x;                      // this is in global namespace namespace Demo {   int b;                    // this is in of Demo namespace, too } int main() {   using namespace Demo;   a = b = x = 100;   cout << a << " " << b << " " << x;   return 0; }                          Related examples in the same category 1. Namespace Demo: define a namespace 2. Demonstrate a namespace 3. Some Namespace Options 4. A namespace can be nested within another 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.