Modify the increment and decrement operators in Exercise 4 so that the prefix versions return a non-cons t reference and the postfix versions return a cons t object. Show that they work correctly and explain why this would be done in practice.
Add an operator++ and operator– to Exercise 2, both the prefix and the postfix versions, such that they return the incremented or decremented object. Make sure that the postfix versions return the correct value.
Create a simple class containing an int and overload the operator+ as a member function. Also provide a print ( ) member function that takes an o stream & as an argument and prints to that o stream &. Test your class to show that it works correctly.
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