Summary
Congratulations! You have reviewed the most important components of the C++ programming language. You know what preprocessor directives to use, how to define variables and functions, how to control the flow of execution with conditional statements and loops, how to comment your code, and how to disregard misleading compiler messages. You even saw how to define and use a C++ class. Very good!
Actually, this is enough for writing most of the C++ code you want to write. This is similar to learning natural language. Pidgin English is much smaller and simpler than English, but it is amazing how much you can express using only a fraction of language facilities available to an experienced native speaker. This is probably yet another manifestation ...
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