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Thinking in C++
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Using headers in projects

When building a project in C++, you’ll usually create it by bringing together a lot of different types (data structures with associated functions). You’ll usually put the declaration for each type or group of associated types in a separate header file, then define the functions for that type in a translation unit. When you use that type, you must include the header file to perform the declarations properly.

Sometimes that pattern will be followed in this book, but more often the examples will be very small, so everything – the structure declarations, function definitions, and the main( ) function – may appear in a single file. However, keep in mind that you’ll want to use separate files and header files in practice.

Thinking in C++
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire