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C++ NamespacesNamespaces in C++ are used to organize too many classes so that it can be easy to handle the application. For accessing the class of a namespace, we need to use namespacename::classname. We can use using keyword so that we don't have to use complete name all the time. In C++, global namespace is the root namespace. The global::std will always refer to the namespace "std" of C++ Framework. C++ namespace ExampleLet's see the simple example of namespace which include variable and functions. #include <iostream> using namespace std; namespace First { void sayHello() { cout<<"Hello First Namespace"<<endl; } } namespace Second { void sayHello() { cout<<"Hello Second Namespace"<<endl; } } int main() { First::sayHello(); Second::sayHello(); return 0; } Output: Hello First Namespace Hello Second Namespace C++ namespace example: by using keywordLet's see another example of namespace where we are using "using" keyword so that we don't have to use complete name for accessing a namespace program. #include <iostream> using namespace std; namespace First{ void sayHello(){ cout << "Hello First Namespace" << endl; } } namespace Second{ void sayHello(){ cout << "Hello Second Namespace" << endl; } } using namespace First; int main () { sayHello(); return 0; } Output: Hello First Namespace
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