The C++ namespace: the namespace extension, extending the original namespace C++ code example


Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Displaying some data to demonstrate how to extend the existing namespace in C++ programming

To show: How to extend the namespace in C++ programming




// C++ namespace extension

#include <iostream>

using namespace std;


// original namespace

namespace One


// declare namespace One variables

int p;

int q;



namespace Two


// declare namespace Two variables

float r;

int s;



// namespace extension of One

namespace One


// declare namespace One function

// void funct1(void);

int funct2(int p);


int funct2(int p)


cout<<"p = "<<p<<endl;

return 0;




int main(void)




return 0;



Output example:


p = 200

Press any key to continue . . .



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