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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.
In the future, you can look at gcc, which is a free compiler for many languages including C++, and is often used on linux. When googling, you probably want to google for C++ Compiler, C++ IDE, C++ Code Editor, and such terms, to find tools.