Reuse namespace : namespace « Language Basics « C++ Tutorial

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C++ Tutorial » Language Basics » namespace 
1.9.4.Reuse namespace
#include <iostream>
using namespace std;

namespace MyNamespace {
  int i;
}

namespace MyNamespace {
  int j;
}

int main()
{
  MyNamespace::i = MyNamespace::j = 10;

  // refer to MyNamespace specifically
  cout << MyNamespace::i * MyNamespace::j << "\n";

  // use MyNamespace namespace
  using namespace MyNamespace;

  cout << i * j;

  return 0;
}
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100
1.9.namespace
1.9.1.A namespace
1.9.2.Use a namespace
1.9.3.A nested namespace
1.9.4.Reuse namespace
1.9.5.Reference variables in namespaces
1.9.6.using namespace in program block
1.9.7.Reference global variable, variable in the nested namespace
1.9.8.Use Namespace to organize functions
1.9.9.function in a namespace reference variables in the same namespace
1.9.10.using namespace std;
1.9.11.Use function defined in a namespace
1.9.12.Using unnamed namespaces.
1.9.13.Using namespace aliases
1.9.14.Using the using directive
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