Question: 18. What is the difference between the interface of a class and the implementation of a class? 19. What are some reasons for writing the

18. What is the difference between the interface of a class and the implementation of a class?

19. What are some reasons for writing the unit testing code before writing the class code?

20. What are some reasons for intermixing the writing of the unit testing code and the class code?

21. What are some reasons for writing unit testing code after you write the class code?

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