25. What is a destructor and what are the uses of declaring a destructor member function in a program? 26. What are the rules governing the declaration of a destructor member function? 27. When does a...

25. What is a destructor and what are the uses of declaring a destructor member function in a program?

26. What are the rules governing the declaration of a destructor member function?

27. When does a destructor member function is invoked in a class?

28. In what way a destructor is different from a delete operator?

29. Explain the importance of mutable modifier.