Initial commit

c++/Others/A namespace can be nested within another.cpp

@@ -0,0 +1,20 @@
+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;
+}