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  1. //Maxwell Brewer                   CS1A                  Chapter 11, p. 648, #13
  2. //
  3. /*******************************************************************************
  4.  * SOFT DRINK VENDING MACHINE SIMULATOR
  5.  * _____________________________________________________________________________
  6.  * This program simulates the operations of a soft drink vending machine. It allows
  7.  * users to view available drinks, select a drink, insert money, and receive change.
  8.  * The program also tracks the machine's profits and updates the stock of drinks
  9.  * after each purchase.
  10.  * 
  11.  * INPUT:
  12.  *    - User inputs the amount of money to insert for their selected drink.
  13.  *    - User selects a drink from a list by entering a number corresponding to the drink.
  14.  * 
  15.  * OUTPUT:
  16.  *    - Displays the change returned to the user.
  17.  *    - Updates the number of available drinks and displays the current machine earnings.
  18.  *    - Informs the user if a drink is sold out or if an invalid amount is entered.
  19.  *******************************************************************************/
  20.  
  21. #include <iostream>
  22. #include <iomanip>
  23. using namespace std;
  24.  
  25. // Structure to represent a soft drink
  26. struct Drink {
  27.     string name;         // Name of the drink
  28.     double cost;         // Cost of a single drink
  29.     int numberAvailable; // Number of available drinks
  30. };
  31.  
  32. // Function prototypes
  33. void initializeDrinks(Drink*&, unsigned&);
  34. void displayDrinks(const Drink*, const unsigned);
  35. double processRequest(Drink*, const unsigned);
  36. void release(Drink*&);
  37.  
  38. // Main function
  39. int main() {
  40.     cout << "============================================\n";
  41.     cout << "\t     :: Soft Drink Machine ::\n";
  42.     cout << "This program simulates a soft drink machine.\n";
  43.     cout << "It displays the list of available drinks,\n";
  44.     cout << "allows you to choose a drink, calculates the change,\n";
  45.     cout << "and keeps track of the profit earned.\n";
  46.     cout << "============================================\n";
  47.  
  48.     // Variables
  49.     int choice = 0;
  50.     unsigned numDrinks = 0;
  51.     double totalEarned = 0;
  52.  
  53.     // Pointer for the drinks array
  54.     Drink* drinks = nullptr;
  55.  
  56.     // Initialize the drinks array
  57.     initializeDrinks(drinks, numDrinks);
  58.  
  59.     // Main loop
  60.     do {
  61.         displayDrinks(drinks, numDrinks);
  62.         cout << "Enter the number of the drink you want [or 0 to quit]: ";
  63.         cin >> choice;
  64.  
  65.         if (choice < 0 || choice > numDrinks) {
  66.  
  67.         cout << "Invalid choice! Please choose a valid number or 0 to quit.\n";
  68.  
  69.         } else if (choice > 0 && choice <= numDrinks) {
  70.             totalEarned += processRequest(drinks, choice - 1);
  71.         }
  72.  
  73.         cout << "============================================\n";
  74.  
  75.     } while (choice != 0);
  76.  
  77.     // Final earnings display
  78.     cout << "Total money earned in this session: $"
  79.          << setprecision(3) << totalEarned << "\n";
  80.     cout << "--------------------------------------------\n";
  81.     cout << "Thank you for using the vending machine!\n";
  82.     cout << "============================================\n";
  83.  
  84.     // Release dynamically allocated memory
  85.     release(drinks);
  86.     return 0;
  87. }
  88.  
  89. // Initialize the drinks array with data
  90. void initializeDrinks(Drink*& drinks, unsigned& size) {
  91.     size = 5;
  92.     drinks = new Drink[size];
  93.  
  94.     // Drink names, prices, and quantities
  95.     string names[] = {"Cola", "Root Beer", "Lemon-Lime", "Grape Soda",
  96.                       "Cream Soda"};
  97.  
  98.     double prices[] = {0.75, 0.75, 0.75, 0.80, 0.80};
  99.     int quantities[] = {20, 20, 20, 20, 20};
  100.  
  101.     for (unsigned i = 0; i < size; ++i) {
  102.         drinks[i].name = names[i];
  103.         drinks[i].cost = prices[i];
  104.         drinks[i].numberAvailable = quantities[i];
  105.     }
  106. }
  107.  
  108. // Display available drinks
  109. void displayDrinks(const Drink* drinks, const unsigned size) {
  110.     cout << setw(5) << left << "#" << setw(15) << left << "Drink Name"
  111.          << "Cost" << setw(20) << right << "Available" << endl;
  112.     cout << "--------------------------------------------\n";
  113.  
  114.     for (unsigned i = 0; i < size; ++i) {
  115.         cout << setw(5) << left << (i + 1) << setw(15) << left
  116.              << drinks[i].name
  117.              << setw(6) << right << fixed << setprecision(2) << drinks[i].cost
  118.              << setw(10) << right << drinks[i].numberAvailable << endl;
  119.     }
  120.     cout << "--------------------------------------------\n";
  121.     cout << "Enter the drink number to select or 0 to quit.\n";
  122. }
  123.  
  124. // Process user selection and return the earnings
  125. double processRequest(Drink* drinks, const unsigned index) {
  126.     cout << "============================================\n";
  127.     if (drinks[index].numberAvailable <= 0) {
  128.         cout << "Sorry, this drink is sold out.\n";
  129.         return 0;
  130.     }
  131.  
  132.     double moneyInserted;
  133.     cout << "Enter the amount of money (max $1.00): ";
  134.     cin >> moneyInserted;
  135.  
  136.     while (moneyInserted != 0 && (moneyInserted > 1.00 ||
  137.            moneyInserted < drinks[index].cost)) 
  138.  
  139.     {
  140.         cout << "Invalid amount. Please enter an amount between " 
  141.              << drinks[index].cost << " and 1.00 or 0 to cancel: ";
  142.         cin >> moneyInserted;
  143.     }
  144.  
  145.     if (moneyInserted == 0) {
  146.         return 0;
  147.     }
  148.  
  149.     cout << "Your change is: $" << fixed << setprecision(3)
  150.          << (moneyInserted - drinks[index].cost) << endl;
  151.  
  152.     drinks[index].numberAvailable--;
  153.     return drinks[index].cost;
  154. }
  155.  
  156. // Release dynamically allocated memory
  157. void release(Drink* &drinks) {
  158.     delete[] drinks;
  159.     drinks = nullptr;
  160. }
Success #stdin #stdout 0.01s 5284KB
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============================================
	     :: Soft Drink Machine ::
This program simulates a soft drink machine.
It displays the list of available drinks,
allows you to choose a drink, calculates the change,
and keeps track of the profit earned.
============================================
#    Drink Name     Cost           Available
--------------------------------------------
1    Cola             0.75        20
2    Root Beer        0.75        20
3    Lemon-Lime       0.75        20
4    Grape Soda       0.80        20
5    Cream Soda       0.80        20
--------------------------------------------
Enter the drink number to select or 0 to quit.
Please enter the number of the drink you want [or 0 to quit]: ============================================
Total money earned in this session: $0.000
--------------------------------------------
Thank you for using the vending machine!
============================================
https://ideone.com/9fqwKE
Chapter 11, p. 648, #13
language:
C++ (gcc 8.3)
created:
16 hours ago
visibility:
public

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