// program to give user option of displaying arithmetic mean, harmonic mean or root mean square of a set of values
#include <iostream>
#include <cmath>
#include <exception>

int main()
{
        try {
                std::cout << "This program will allow you to view either the arithmetic mean, harmonic mean or root mean square of a set of values." << '\n';
                std::cout << "How many values do you wish to enter? " << '\n';

                int count(0);
                std::cin >> count;
                if (not std::cin) throw std::exception();

                int numcount(0);
                double value(0.0);
                double meantotal(0.0);
                double harmtotal(0.0);
                double harmresult(0.0);
                double rsm_total(0.0);
                double arith_mean(0.0);


                do {
                        std::cout << "Please Type a number :";
                        std::cin >> value;
                        if (not std::cin) throw std::exception();

                        ++numcount;
                        meantotal += value;

                        harmresult = (1/value);
                        harmtotal += harmresult;

                        rsm_total += value * value;
                        arith_mean = rsm_total/count;

                } while (numcount < count);

                double average = meantotal/count;
                double harmonicmean = count/harmtotal;
                double rsm = std::sqrt(arith_mean);

                do {
                        std::cout << "Thank You for entering these values. Please indicate which calculation you want to see." << '\n';
                        std::cout << "Press '1' to see the Mean\n";
                        std::cout << "Press '2' to see the Harmonic Mean\n";
                        std::cout << "Press '3' to see the Root Square Mean\n";
                        std::cout << "Enter '999' to end the program\n";
                        std::cout << "VIEW :";

                        int view(0);
                        std::cin >> view;
                        if (not std::cin) throw std::exception();

                        if (view == 999) break;

                        if (view == 1) {
                                std::cout << "The Arithmetic Mean of these values is " << average << '\n';
                        }

                        if (view == 2) {
                                std::cout << "The Harmonic Mean of these values is " << harmonicmean << '\n';
                        }

                        if (view == 3) {
                                std::cout << "The Root Square Mean of these values is " << rsm << '\n';

                        }

                } while (true);

        }

        catch (...) {
                std::cerr << "***An exception was thrown.***\n";
        }

}