Menu Based Program using C++

 /*    
    This challenge is about using a collection (list) of integers and allowing the user
    to select options from a menu to perform operations on the list.
    
    Your program should display a menu options to the user as follows:
    
    P - Print numbers
    A - Add a number
    M - Display mean of the numbers
    S - Display the smallest number
    L - Display the largest number
    Q - Quit

    Enter your choice:
*/
   #include <iostream>
    #include <vector>

    using namespace std;
    void print(vector<int> &numbers);
    void add(vector<int> &numbers);
    void display_mean(vector<int> &numbers);
    void smallest_value(vector<int> &numbers);
    void largest_value(vector<int> &numbers);



    int main() {

        char selection {};
         vector<int> numbers {};
         int num_to_add;
        do{
            // Display menu
            cout << "\nP - Print numbers" << endl;
            cout << "A - Add a number" << endl;
            cout << "M - Display mean of the numbers" << endl;
            cout << "S - Display the smallest number" << endl;
            cout << "L - Display the largest number"<< endl;
            cout << "Q - Quit" << endl;
            cout << "\nEnter your choice: ";
            cin >> selection;


            if (selection == 'P' || selection == 'p') {
                print(numbers);

                }
             else if (selection == 'A' || selection == 'a') {
                 add(numbers);
             }

             else if (selection == 'M' || selection == 'm') {
                 display_mean(numbers);

                }
             else if (selection == 'S' || selection == 's') {
                 smallest_value(numbers);

                }
            else if (selection == 'L' || selection == 'l') {
                largest_value(numbers);

                }
            else if (selection == 'Q' || selection == 'q') {
                cout << "Goodbye" << endl;
            } else {
                cout << "Unknown selection, please try again" << endl;

            }

    }while(selection != 'q' && selection != 'Q');


        cout  << endl;
        return 0;
    }

    void print(vector<int> &numbers){

        if (numbers.size() == 0)
                    cout << "[] - the list is empty" << endl;
                else {
                    cout << "[ ";
                    for (auto num: numbers)
                        cout << num << " ";
                    cout << "]" << endl;

                }

    }
    void add(vector<int> &numbers){
        int num_to_add;

                cout << "Enter an integer to add to the list: ";
                cin >> num_to_add;
                numbers.push_back(num_to_add);
                cout << num_to_add << " added" << endl;


    }
    void display_mean(vector<int> &numbers){
         if (numbers.size() == 0)
                    cout << "Unable to calculate mean - no data" << endl;
                else {
                    int total {};
                    for (auto num: numbers)
                        total += num;
                    cout << "The mean is : " << static_cast<double>(total)/numbers.size() << endl;
                }


    }
    void smallest_value(vector <int> &numbers){
         if (numbers.size() == 0)
                    cout << "Unable to determine the smallest - list is empty" << endl;
                else {
                    int smallest = numbers.at(0);
                    for (auto num: numbers)
                        if (num < smallest)
                            smallest = num;
                    cout << "The smallest number is: " << smallest << endl;

                }

    }
    void largest_value(vector<int> &numbers){
        if (numbers.size() == 0)
                    cout << "Unable to determine largest - list is empty"<< endl;
                else {
                    int largest = numbers.at(0);
                    for (auto num: numbers)
                        if (num > largest)
                            largest = num;
                    cout << "The largest number is: " << largest << endl;

            }

    }

Coder

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