#include <iostream>
#include <iomanip>
using namespace std;

int num_of_employees();
int days_absent(int);
double average_days_absent(int, int);
int input_validation(bool, int);

int main()
{
    int total_num_employees = 0, total_days_absent = 0;
    double avg_days_absent = 0.0;

    cout << "Days Out Program" << endl;

    total_num_employees = num_of_employees();
    total_days_absent = days_absent(total_num_employees);

    avg_days_absent = average_days_absent(total_num_employees, total_days_absent);

    cout << showpoint << fixed << setprecision(2);
    cout << "The average number of days absent was " << avg_days_absent << endl;

    return 0;
}

int num_of_employees()
{
    int employees = 0;
    cout << "Enter the number of employees in your company. [1, 2, 3...]: ";
    cin >> employees;

    employees = input_validation(true, employees);
    return employees;
}

int days_absent(int total_num_employees)
{
    int absent = 0, total_absent = 0;
    cout << "Enter the number of days absent for each employee. [0, 1, 2, 3...]: " << endl;

    for (int employees = 1; employees <= total_num_employees; employees++)
    {
        cout << "Employee #" << employees << ": "; cin >> absent;
        absent = input_validation(false, absent);
        total_absent += absent;
    }
    return total_absent;
}

double average_days_absent(int total_num_employees, int total_days_absent)
{
    return (static_cast<double>(total_days_absent) / static_cast<double>(total_num_employees));
}

int input_validation(bool is_employees, int input)
{
    if (is_employees)
    {
        while (input < 1)
        {
            cout << "Number of employees must be at least 1. " << endl;
            cout << "Enter the number of employees in your company. [1, 2, 3...]: ";
            cin >> input;
        }
    }
    else
    {
        while (input < 0)
        {
            cout << "Number of days absent must not be less than 0. " << endl;
            cout << "Enter the number of days absent: " << endl;
            cin >> input;
        }
    }
    return input;
}