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Definition and use of namespaces
Namespaces example from a Well House Consultants training course
More on Namespaces [link]

This example is described in the following article(s):
   • Separating groups of variables into namespaces - [link]
   • Using C and C++ functions in the same program - how to do it - [link]

Source code: Ns.cpp Module: C237
#include <iostream>

/* Namespaces in C++ allow you to subdivide your variable space into a series of
areas, thus providing you with the ability to bring in a whole lot of variables
as a "clump" or group to your program. The std namespace includes objects such
as cin, cout, cerr, endl, exception - and many more - and is often imported in
full. */


// Define two namespaces and their variables

namespace platypus {
        int feet;
        int heads;
        }

namespace zaphod {
        int feet;
        int heads;
        }

/* could also do

using namespace std;

rather than std::cout BUT that might clutter your default namespace.
So if you just want one or two or have LOTS of namespaces, best to do
it the way I have below.

using std::cout;

Or even cherry picking as in the actual code below
*/


// This example also show you how to call a C function from C++:

extern "C" int avg(int, int);

int main () {

        platypus::feet = 4;
        zaphod::feet = 2;

        platypus::heads = 1;
        zaphod::heads = 2;

        std::cout << "Heads " << platypus::heads << " feet "
                <<platypus::feet << std::endl;
        std::cout << "Heads " << zaphod::heads << " feet "
                <<zaphod::feet << std::endl;

        int num = avg(8, 24);

        std::cout << num << std::endl;

        }

/* Output:

92:antrim graham$ ./Ns
Heads 1 feet 4
Heads 2 feet 2
16
92:antrim graham$

*/


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in C++
 * C++ for C Programmers
 * C and C++ Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering C and C++ are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Namespaces" training module. You'll find a description of the topic and some other closely related examples on the "Namespaces" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre or under an Open Training Notes License from our sister site http://www.training-notes.co.uk.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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This web site is written and maintained by Well House Consultants.

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