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Sagot :
Last option is correct. The purpose of a constructor is to specify the public interface.
A constructor, also known as a ctor, is a particular kind of subroutine that is called when creating an object in class-based, object-oriented programming. It often accepts arguments that the constructor uses to set the necessary member variables as it gets the new object ready for usage.
Constructors are similar to instance methods, but they are distinct from them in that they don't have explicit return types, aren't implicitly inherited, and frequently have different scope modifier rules than methods do. The name of the constructor frequently matches that of the declaring class. They must initialize the data members of the object and establish the class invariant, failing if the invariant is incorrect. The outcome of a well-written constructor is an object that is in a usable state.
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