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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.
The compiled C++ program image consists of CPU machine code, which may run on a physical CPU, or on a virtual/emulated one. In normal usage, C++ programs run on physical hardware. A typical (hosted) C++ program requires an operating system for startup and uses it for I/O and other system calls. A freestanding C++ program (OS kernel, bootloader, etc) does not even need an OS to run.