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Traditional programs are written as systems of cooperating functions. Object-oriented programs are written as systems of cooperating classes that include both data and functions. In the first part of this book, I concentrated mainly on techniques of writing functions. The skills of writing processing code and implementing communications between functions are crucial for creating high-quality C++ programs.
In the second part of the book, I concentrated on writing classes. The skills of binding together data and operations and implementing classes as servers and as clients are crucial for creating high-quality C++ programs.