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C++ supports object-oriented programming, but OO is not intrinsic to the language. In fact, the main function isn't a member of an object. In smalltalk or Java, you can't tie your shoes (or write Hello, world) without at least one class.
This is called an object file, and is also called a .o file. The object file doesn't have enough information to run by itself. It is not an executable. Typically, when you have many .cpp files, you will end up creating a corresponding .o file. In g++ and cxx (and most UNIX C++ compilers), this is done with the -c option. g++ -Wall -c MovieTheater.cpp cxx -w0 -std strict_ansi -c MovieTheater.cpp The -c option can appear anywhere in the command.