using namespace std; : namespace « Language Basics « C++ Tutorial






  1. C++ Tutorial
  2. Language Basics
  3. namespace
#include <iostream>
using namespace std;

int main()
{
   // Print hello world on the screen
   cout << "Hello World";
   return 0;
}

Hello World"




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