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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.
C++ is a superset of C. You can write C code and compile it with the C++ compiler. So for Arduino programming, most projects will be straight C. Library development and more advanced things may prompt you to use C++. Itâs not so simple: Incompatibilities Between ISO C and ISO C++. C and C++ start with the same letter, use semicolon and curly braces, like C#. C and C++ are much more similar.