Day of the Year Modification
Modify the DayOfYear class, written in an earlier
Add the following overloaded operators:
++ prefix and postfix increment operators. These operators should modify the DayOfYear object so that it represents the next day. If the day is already the end of the year, the new value of the object will represent the first day of the year.
−− prefix and postfix decrement operators. These operators should modify the DayOfYear object so that it represents the previous day. If the day is already the first day of the year, the new value of the object will represent the last day of the year.
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