What is virtual Function.
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Answer / poonam
Virtual function is a function that uses keyword "virtual"
with the datatype of the function. When the base class as
well as the derived class contains a function both having
the same name, just to resolve ambiguity and copy of the
same data again and again we use the keyword "virtual"
preeceeding it. It is used to achieve poymorphism.
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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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