What is class and object C?

The class is defined in two different sections namely @interface and @implementation . Almost everything is in form of objects. Objects receive messages and objects are often referred as receivers. Objects contain instance variables. Objects and instance variables have scope.

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Do I need to use classes in C++?

No, you should not put everything into classes . Whoever told you that was wrong. C++ is not (just) an OO language, it is a multi-paradigm language. Additionally, putting everything into classes does not mean that code is object oriented (especially since for static methods you don’t need actual objects, just types).

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