Define a class called List that can hold a list of values of type double. Model your class definition after the class TemperatureList given in Display 11.10, but your class List will make no reference to temperatures when it outputs values. The values may represent any sort of data items as long as they are of type double. Include the additional features specified in Self-Test Exercises 21 and 22. Change the member function names so that they do not refer to temperature. Add a member function called get_last that takes no arguments and returns the last item on the list. The member function get_last does not change the list, and it should not be called if the list is empty. Add another member function called delete_last that deletes the last element on the list. The member function delete_last is a void function. Note that when the last element is deleted, the member variable size must be adjusted. If delete_last is called with an empty list as the calling object, the function call has no effect. Design a program to thoroughly test your definition for the class List.

Exercises 21

Change the class TemperatureList given in Display 11.10 by adding a member function called get_size, which takes no arguments and returns the number of temperatures on the list.

Exercises 22

Change the type TemperatureList given in Display 11.10 by adding a member function called get_temperature, which takes one int argument that is an integer greater than or equal to 0 and strictly less than MAX_LIST_SIZE. The function returns a value of type double, which is the temperature in that position on the list. So, with an argument of 0, get_temperature returns the first temperature; with an argument of 1, it returns the second temperature, and so forth. Assume that get_ temperature will not be called with an argument that specifies a location on the list that does not currently contain a temperature.