//  Elaine Torrezn              #13 CS1A Chapter 11 – Drink Machine Simulator
 
/********************************************************************************************
 *
 *                                  DRINK MACHINE SIMULATOR
 *
 * ------------------------------------------------------------------------------------------
 * This program simulates a soft drink vending machine. A structure is used to store the
 * following data for each drink:
 *
 *      - Drink name
 *      - Drink cost
 *      - Number of drinks currently in the machine
 *
 * The program creates an array of five structures and initializes them with the following
 * data (all starting with 20 drinks each):
 *
 *      Cola        $0.75
 *      Root Beer   $0.75
 *      Lemon-Lime  $0.75
 *      Grape Soda  $0.80
 *      Cream Soda  $0.80
 *
 * The program then enters a loop that:
 *      1) Displays the list of drinks and a "Quit" option.
 *      2) Allows the user to select a drink or quit the program.
 *      3) If a drink is selected:
 *             - Asks the user to insert an amount of money.
 *             - Validates the amount (0.00 – 1.00, not negative).
 *             - If the drink is sold out, displays a message.
 *             - If not enough money is inserted, displays a message and returns all money.
 *             - Otherwise, dispenses the drink, shows the change, subtracts one drink from
 *               the machine, and adds the drink cost to the machine's total earnings.
 *      4) Repeats until the user chooses to quit.
 *
 * When the user chooses to quit, the program displays the total amount of money the machine
 * has earned.
 * ------------------------------------------------------------------------------------------
 *
 * INPUT
 *      choice    : User's drink menu choice (1–5 for drinks, 0 to quit)
 *      money     : Amount of money inserted (0.00 – 1.00)
 *
 * OUTPUT
 *      For each purchase:
 *          - Messages about sold-out or insufficient funds (if applicable)
 *          - Amount of change returned
 *      At the end:
 *          - Total amount of money earned by the machine
 *
 * INPUT VALIDATION
 *      - Drink selection must be 0–5.
 *      - When the user enters an amount of money, do not accept negative values or values
 *        greater than $1.00.
 *
 ********************************************************************************************/
 
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
 
//------------------------------------------------------------
// Structure for a drink type in the machine
//------------------------------------------------------------
struct Drink {
    string name;   // Drink name
    double cost;   // Drink cost
    int    count;  // Number of drinks in machine
};
 
// Function prototype
void showMenu(const Drink drinks[], int size);
 
int main()
{
    const int NUM_DRINKS = 5;
 
    // Initialize the drink machine
    Drink drinks[NUM_DRINKS] = {
        {"Cola",       0.75, 20},
        {"Root Beer",  0.75, 20},
        {"Lemon-Lime", 0.75, 20},
        {"Grape Soda", 0.80, 20},
        {"Cream Soda", 0.80, 20}
    };
 
    int choice;               // User's menu choice
    double money;             // Money inserted
    double change;            // Change to return
    double totalEarnings = 0; // Total amount earned by the machine
 
    cout << fixed << setprecision(2);
 
    do {
        showMenu(drinks, NUM_DRINKS);
 
        cout << "Enter your choice (1-5, or 0 to quit): ";
        cin  >> choice;
 
        // Validate menu choice
        while (choice < 0 || choice > NUM_DRINKS) {
            cout << "  **ERROR** Please enter a value from 0 to " << NUM_DRINKS << ": ";
            cin  >> choice;
        }
 
        if (choice == 0) {
            // Quit
            break;
        }
 
        int index = choice - 1;  // Array index (0–4)
 
        // Check if drink is sold out
        if (drinks[index].count == 0) {
            cout << "\nSorry, " << drinks[index].name << " is SOLD OUT.\n\n";
            continue;  // Skip to next loop iteration
        }
 
        // Ask user for money
        cout << "Insert money for " << drinks[index].name
             << " (cost $" << drinks[index].cost << ", max $1.00): ";
        cin  >> money;
 
        // Validate money amount (0.00 – 1.00, not negative)
        while (money < 0.0 || money > 1.0) {
            cout << "  **ERROR** Amount must be between $0.00 and $1.00. Re-enter: ";
            cin  >> money;
        }
 
        // Check if enough money was inserted
        if (money < drinks[index].cost) {
            cout << "\nNot enough money inserted. Returning $" << money << ".\n\n";
        } else {
            // Successful purchase
            change = money - drinks[index].cost;
            drinks[index].count--;          // One less drink in the machine
            totalEarnings += drinks[index].cost;
 
            cout << "\nDispensing " << drinks[index].name << "...\n";
            cout << "Your change is $" << change << ".\n\n";
        }
 
    } while (true);
 
    // Display total money earned
    cout << "\nTotal money earned by the machine: $" << totalEarnings << endl;
 
    return 0;
}
 
//------------------------------------------------------------
// Displays the drink menu
//------------------------------------------------------------
void showMenu(const Drink drinks[], int size)
{
    cout << "\nDRINK MACHINE MENU\n";
    cout << "-----------------------------------------\n";
 
    for (int i = 0; i < size; ++i) {
        cout << (i + 1) << ". " << left << setw(12) << drinks[i].name
             << " $" << drinks[i].cost
             << "   (" << drinks[i].count << " left)\n";
    }
 
    cout << "0. Quit\n\n";
}
 

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MQoxLjAwCjQKMS4wMAo1CjAuNTAKMgowLjc1CjAK

1
1.00
4
1.00
5
0.50
2
0.75
0