Improve the appointment book program of Exercises P10.12 and P10.13 by lettingthe user
Chapter 10, Problem P10.14(choose chapter or problem)
Improve the appointment book program of Exercises P10.12 and P10.13 by lettingthe user save the appointment data to a file and reload the data from a file. The sav ingpart is straightforward: Make a virtual function save. Save out the type, descrip tion,date, and time. The loading part is not so easy. You must first determine the type ofthe appointment to be loaded, create an object of that type with its default constructor,and then call a virtual load function to load the remainder.
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