Answer Posted / Sudipa Acharjee

To swap the values of two variables containing ASCII characters, you can use a temporary variable in C++ as follows:

```cpp
char a = 'A';
char b = 'B';

// Swap a and b
char temp = a;
a = b;
b = temp;
```

Question 1: 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. *This Should Be Done IN C++

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