// This program keeps inventory of eggs in your refridgerator.
// The user starts with a certain number of eggs in their 
// refridgerator.  The user is asked how many cartons of
// eggs they have used, and how many individual eggs in addition
// to the carton, and computes the number of eggs remaining in
// the refridgerator.
//
// For example, when you run the program you should see this:
//
// HOW MANY EGGS ARE IN YOUR FRIDGE?  47
// HOW MANY EGG CARTONS HAVE YOU USED? 2
// YOU HAVE 23 EGGS LEFT
//   [23 = 47 - 2*12]
// HOW MANY INDIVIDUAL EGGS HAVE YOU EATEN? 7
// YOU HAVE 16 EGGS LEFT

#include <iostream>

int main()
{
    int used_egg_cartons;
    int current_eggs_in_fridge;
    int eaten_eggs;

    const int EGGS_IN_CARTON = 12;

    cout << "How many eggs are in your fridge? ";
    cin >> current_eggs_in_fridge;

    cout << "How many egg cartons have you used? ";
    cin >> used_egg_cartons;

    current_eggs_in_fridge = 
           current_eggs_in_fridge - (used_egg_cartons * EGGS_IN_CARTON);
    // note: parentheses above were not necessary but were included
    // to be clear on the order of evaluation

    if (current_eggs_in_fridge < 0) 
    {
       cout << "You've used more eggs than you have" << endl;
       current_eggs_in_fridge = 0;
    }
    else 
    {
        cout << "You have " << current_eggs_in_fridge << " eggs left" << endl;

        cout << "How many individual eggs have you eaten? ";
        cin >> eaten_eggs;

        current_eggs_in_fridge = (current_eggs_in_fridge - eaten_eggs);
        // Those parentheses weren't needed either

        if (current_eggs_in_fridge < 0) 
        {
           cout << "You've used more eggs than you have" << endl;
           current_eggs_in_fridge = 0;
        }
        else 
        {
            cout << "You have " << current_eggs_in_fridge << " eggs left\n";
        }
    }
}