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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.
Depends on the compiler you are using. If you don't have one installed, I'd recommend Dev C++: The Dev-C++ Resource Site. It comes with g++, so if you add Dev C++'s bin directory to your system path, you could compile your program like so: g++ -o hello.exe helloworld.cpp.