Question

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.

Short answer

Now, I will create a short answer based on the provided step-by-step solution. To add the `get_temperature` function to the `TemperatureList` class, follow these steps: 1. Add the `get_temperature` function declaration in the public section of the `TemperatureList` class: ```cpp class TemperatureList { public: // ... double get_temperature(int position); // New function added here // ... }; ``` 2. Implement the `get_temperature` function: ```cpp double TemperatureList::get_temperature(int position) { if (position >= 0 && position < MAX_LIST_SIZE) { return list[position]; } else { // Handle possible error scenario std::cerr << "Invalid position argument. Must be greater than or equal to 0 and strictly less than MAX_LIST_SIZE" << std::endl; return -1; } } ``` This function first checks if the provided integer position is within the valid range (0 to MAX_LIST_SIZE - 1). If it is within the range, it returns the temperature value at that position. Otherwise, an error message is printed, and an invalid value of -1 is returned.

Step-by-step solution

Add a new member function to the class

Add the get_temperature function declaration in the public section of the TemperatureList class: ```cpp class TemperatureList { public: TemperatureList(); void add_temperature(double new_temperature, int position); double get_temperature(int position); // New function added here void output(ostream& outs); private: double list[MAX_LIST_SIZE]; int temperatures_stored; }; ```

Implement the get_temperature function

Now we'll define the get_temperature function: ```cpp double TemperatureList::get_temperature(int position) { if (position >= 0 && position < MAX_LIST_SIZE) { return list[position]; } else { // Handle possible error scenario (not required as per the problem's // assumption, but can be added for better error handling) std::cerr << "Invalid position argument. Must be greater than or equal to 0 and strictly less than MAX_LIST_SIZE" << std::endl; return -1; } } ``` In this function, we first check if the provided integer position is within the valid range (0 to MAX_LIST_SIZE - 1). If it is within the range, we return the temperature value at that position. Otherwise, we can print an error message and return an invalid value, such as -1 (although this scenario is assumed to not happen according to the exercise, having some error handling is preferable). With the above steps, we have successfully added and implemented the get_temperature function in the TemperatureList class.