Answer / karthiga

1)provide a conceptual framework
2)avoid rewriting code
3)facilitating class libraries
4)all of these

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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What is virtual Function.

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to remove the repeated numbers from the given . i.e.., if the input is 12233 output should of 123

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