Gain insights into dynamic memory allocation, creating classes, and functions. Delve into inheritance, I/O, exception handling. Explore 90+ examples to master advanced C++ functionalities.

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If you’re looking to sharpen up your C++ programming skills, then you’re in the right place. You will start with learning about dynamic memory allocation, how to create classes, and constructors. 

In the latter half of the course, inheritance, functions, I/O, exception handling, and more. Throughout the course, you will study over 90 carefully designed examples aimed to enhance your understanding of the C++ language.  

By the time you finish this course, you will be able to use more advanced functionality in your C++ programs.

C++ Programming for Experienced Engineers

# Problem

Rewrite program in “[Number Class with Methods defined Inside it](https://www.educative.io/courses/cpp-programming-experienced-devs/number-class-with-methods-defined-inside-it)” so that the `Number` class is stored in a dynamically linked library. 

# Solution
Here is a solution to the above problem. You have to press the “**Run**” button to get the terminal window under the code widget. After that, you will be able to create a dynamic library using the given commands.

**Create dynamic library using command-line**

If you wish to build the project using the *command-line*, carry out the following steps:

1. Compile the library to position independent code.
    ```txt
    g++ -c Number.cpp -fpic
    ```
 
2. Create the dynamic library (shared object file). 
    ```txt
    g++ Number.o -shared -o libNumber.so 
    ```

3. Let's compile the driver code. 
    ```txt
    g++ main.cpp -o main.out -lNumber -L.
    ```

4. At this stage, if you run the program with `./main.out`, it wouldn’t be able to locate the library. The linker searches for dynamic libraries in an environment variable `LD_LIBRARY_PATH`. We need to add the path for the directory where the `.so` file is placed in this variable. 
    ```txt
    export LD_LIBRARY_PATH=/usr/local/educative:$LD_LIBRARY_PATH
    ```

4. Run the program.
    ```
    ./main.out
    ```


Learn to create a class stored in a dynamically linked library.

Getting Off the Ground

Starters

Basic C++ Examples

Class Organization Examples

Class Constructor Examples

Classes and Objects Examples

More Classes and Objects Examples

Function Examples

Function Overloading Examples

Operator Overloading Examples

Free Store Examples

Inheritance Examples

Virtual Function Examples

Input Output Examples

Template Examples

Exception Handling Examples

STL Examples

Miscellaneous Examples

Conclusion

Number Class in a Dynamically Linked Library

Problem