3. Class concept
A class is therefore a generalization of the notion of user-defined type, in which both data (referred to in C++ as "data members") and methods (referred to as "member functions") are associated. In pure OOP, data is "encapsulated", meaning it can only be accessed via methods. C++ allows you to encapsulate only part of a class's data.
3.1 Declaring and defining a class
The declaration of a class specifies which members (data or functions) are public (i.e. accessible to the class user) and which are private (inaccessible to the class user). To do this, we use the keywords public and private, as in this example in which the class point has two private data members x and y and three public member functions initialize, move and display :
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