Namespace

C++ Namespace and Inline Namespace Example

This C++ program demonstrates the usage of namespaces, classes, functions, and inline namespaces.

Overview

The code is organized into the Data namespace, which contains various elements such as variables, functions, classes, and nested namespaces.

• The variable integer variable is defined in the Data namespace.
• The function function prints "Hello World!" to the console.
• The App class is defined within the Data namespace. It has a member function function that prompts the user for input and returns the entered value.
• Nested namespaces (Region, Supregion1, and Supregion2) are used to organize boolean variables (data) with different values.
• Two unnamed namespaces are used to define string variables (word1 and word2) with different values.
• An inline namespace (LineRegion) contains a single variable data, initialized with a random value.

Usage

The main function demonstrates the usage of elements from the Data namespace:

• Printing the value of variable.
• Calling the function function.
• Creating an instance of the App class and calling its function method.
• Printing the values of variables in the nested Region namespace.
• Printing the concatenated strings word1 and word2.
• Printing the value of the data variable in the LineRegion namespace.

How to Run

To compile and run the program, follow these steps:

1. Save the code in a file named main.cpp.
2. Open a terminal or command prompt.
3. Navigate to the directory containing main.cpp.
4. Compile the code using a C++ compiler (e.g., g++): g++ main.cpp -o program
5. Run the compiled program: ./program

You should see the output printed to the console, demonstrating the usage of namespaces, classes, functions, and inline namespaces.