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- In traditional programming environments, the source code that
- makes up programs is divided into separate files. Some of these
- files contain code that is unique to the program, and some (called
- header files) contain code that is shared among many programs.
- The program has to be able to make objects that are declared in
- one file available to code in another file. This section
- describes how this is done in C++: by including header files, and
- by declaring objects with the keyword "extern".
-