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  • Namespace in C++.

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    Namespace

    In C++ two variables with the same name are not possible in the same scope i.e a name given to specific type or function represent one entity in a particluar scope but with namespaces, there is a possibility to create two variables or member functions having the same name. A namespace can be defined as a declarative region that is providing a specific scope to the identifiers such as names of the types, function, variables etc which are declared inside it.

    Example of Namespace:

    #include <iostream>
    using namespace std;
    
    namespace first   // Variable created inside namespace
    {
    	int value = 600;
    }
    
    int value = 400;  //A Global variable with same name as variable inside namespace first
    
    int main()
    {
    	int value = 900;  	// A Local variable with same name as variable inside namespace first
    
    	cout << first::value << '\n'; //Namespace variables can be accessed from outside the namespace using the scope ::
        cout << value << '\n';  //Local variable with same name as namespace variable will be accessed
    
    	return 0;
    }
    

    Output:

    600
    900

     

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