You Will Be Creating A Person Class

You Will Be Creating A Person Class This Person Class Will Have The

This assignment requires creating a C++ program that defines a Person class encapsulating information about individuals, including their ID number, name, height (in feet and inches), and weight. The class should include methods to store these data members, retrieve the ID and Name, and compute the BMI and BMI classification based on the provided data. Additionally, a standalone function should compare two person objects by their names to facilitate sorting. The program will involve reading multiple person entries from the user, storing them in an array or vector, sorting based on names, and displaying the BMI and classifications for each person.

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The development of a Person class in C++ serves as an excellent example of object-oriented programming that encapsulates data and related behaviors. This class will manage personal attributes such as ID number, name, height, and weight, along with methods for storing, retrieving, and processing this data, especially for BMI calculation and classification.

The initial step involves defining the class with private data members: an integer for ID, a string for name, two integers for height in feet and inches, and a double for weight in pounds. To interact with these private members, public member functions will be implemented. For storing data, setter functions are necessary. For example, a function setID(int id) assigns a value to the ID, while getID() returns it. Similar functions will exist for name, height, and weight.

The height handling involves two separate parameters: feet and inches. The class should provide a method setHeight(int feet, int inches) to store height information. For BMI calculation, a method must convert height to total inches by: total_inches = feet 12 + inches. The BMI formula relying on pounds and inches is BMI = (weight 703) / (height_in_inches)^2. To facilitate this, an implementation of a method calculateBMI() will perform these computations, returning a double value.

The BMI classification follows established standards. A method classifyBMI() will take the BMI value and return a string indicating the classification: "Underweight," "Normal weight," "Overweight," or "Obesity." This method will use conditional statements to compare BMI against thresholds and return the corresponding string.

A crucial aspect involves comparing two person objects based on their names, used for sorting. Since std::sort requires a comparator function that takes two pointers or references, a standalone function will be created, for example, comparePersons(const Person&, const Person&), that returns true if the first person’s name is lexicographically less than the second’s. This function will be passed as the third argument to the sort function to order a collection of person objects alphabetically by name.

The main program involves creating a container (array or vector) of Person objects. It prompts the user iteratively for input: asking for ID, name, height in feet and inches, and weight, repeating until the user enters an ID less than zero. Before accepting the name, we must clear the input buffer using cin.clear() and cin.ignore() to avoid leftover newline characters disrupting input reading, especially with getline for string input.

Once data collection is complete, the program will sort the vector or array based on person names using std::sort with the comparison function. Then, it will iterate through the sorted collection, displaying each person’s ID, name, BMI, and BMI classification, formatted clearly for readability.

Throughout development, it is advised to build the program incrementally. Start by implementing the class with minimal functionality, testing each method successively. For example, implement only the ID storage and retrieval methods first, verify their correctness, then add name methods, and so forth. Once all data members are managed correctly for a single person, expand to multiple persons using a vector or array and implement the sorting mechanism.

This systematic approach simplifies debugging and ensures correctness. The final output should be a detailed report of each person's ID, name, BMI, and BMI classification, sorted alphabetically by name, closely mimicking real-world scenarios in managing personal health data.

References

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