Extend Programming Project 10.1 from Chapter 10 in which you implemented a two dimensional...

Extend Programming Project 10.1 from Chapter 10 in which you implemented a two dimensional array class by placing the class definition and implementation in a namespace, then providing access to the names in the namespace. Test your code. To provide access to names in namespaces, you may use local using declarations such as

or use local using directives such as

inside a block, or qualify names using the names of namespaces, such as std::cout.

You may not use global namespace directives such as the following which are not in a block and apply to the entire file: