Define namespaces

Namespaces is used to group together all the related classes.

To use namespace, using keyword or scope resolution operator can be used.

namespace emp
{
           class Manager
           {
                public:
                       static void showDetail()
                       {
                              ...
                              ...
                       }
          };
}

To use

emp::Manage::showDetail();

or

using namespace emp;
Manager::showDetail();

What are the guidelines of using namespaces?  

To name a namespace, utilize the company name followed by the department and optionally followed by the features and technology used.

For example:

MyCompany.Media.Design

The following are some guidelines to name namespaces.

• The prefix of company name avoids the possibility of two or more namespaces with same name.
• Use a stable, noticeable department or technology name followed by the company name at the hierarchical name of second level.
• Use organizational hierarchies as the basis for name space hierarchies.
• Separate the logical components with periods (.).
• Avoid giving same name for classes and name spaces.