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Generally, you choose a source-code file name, such as
box_car, to describe the file's contents, and you choose a
source-code extension, such as cxx, to indicate
that the file contains source code, producing a complete file name, such as
box_car.cxx. Conventions on file extensions for C++ source code
vary: some programmers prefer—and some compilers require—C,
cc, or cpp.
The cxx variant is supposed to suggest two plus signs rotated
45°: many operating systems do not permit real plus signs to
appear in names.