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Question:

Implement a base class Appointment and derived classes Onetime, Daily, Weekly, and
Monthly. An appointment has a description (for example, “see the dentist”) and a date
and time. Write a virtual function occurs_on(int year, int month, int day) that checks
whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a vector of
Appointment* with a mixture of appointments. Have the user enter a date and print out
all appointments that happen on that date.


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