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  1. //Maxwell Brewer                   CS1A                  Chapter 11, p. 648, #13
  2. //
  3. /*******************************************************************************
  4.  * VEND SOFT DRINKS
  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
  14.  *      to the drink.
  15.  * 
  16.  * OUTPUT:
  17.  *    - Displays the change returned to the user.
  18.  *    - Updates the number of available drinks and displays the current
  19.  *      machine earnings.
  20.  *    - Informs the user if a drink is sold out or if an invalid amount
  21.  *      is entered.
  22.  *******************************************************************************/
  23.  
  24. #include <iostream>
  25. #include <iomanip>
  26. using namespace std;
  27.  
  28. // Structure to represent a soft drink
  29. struct Drink {
  30.     string name;         // Name of the drink
  31.     double cost;         // Cost of a single drink
  32.     int numberAvailable; // Number of available drinks
  33. };
  34.  
  35. // Function prototypes
  36. void initializeDrinks(Drink*&, unsigned&);
  37. void displayDrinks(const Drink*, const unsigned);
  38. double processRequest(Drink*, const unsigned);
  39. void release(Drink*&);
  40.  
  41. // Main function
  42. int main() {
  43.     cout << "============================================\n";
  44.     cout << "\t     :: Soft Drink Machine ::\n";
  45.     cout << "This program simulates a soft drink machine.\n";
  46.     cout << "It displays the list of available drinks,\n";
  47.     cout << "allows you to choose a drink, calculates the change,\n";
  48.     cout << "and keeps track of the profit earned.\n";
  49.     cout << "============================================\n";
  50.  
  51.     // Variables
  52.     int choice = 0;
  53.     unsigned numDrinks = 0;
  54.     double totalEarned = 0;
  55.  
  56.     // Pointer for the drinks array
  57.     Drink* drinks = nullptr;
  58.  
  59.     // Initialize the drinks array
  60.     initializeDrinks(drinks, numDrinks);
  61.  
  62.     // Main loop
  63.     do {
  64.         displayDrinks(drinks, numDrinks);
  65.         cout << "Enter the number of the drink you want [or 0 to quit]: ";
  66.         cin >> choice;
  67.  
  68.         if (choice < 0 || choice > numDrinks) {
  69.  
  70.         cout << "Invalid choice! Please choose a valid number or 0 to quit.\n";
  71.  
  72.         } else if (choice > 0 && choice <= numDrinks) {
  73.             totalEarned += processRequest(drinks, choice - 1);
  74.         }
  75.  
  76.         cout << "============================================\n";
  77.  
  78.     } while (choice != 0);
  79.  
  80.     // Final earnings display
  81.     cout << "Total money earned in this session: $"
  82.          << setprecision(3) << totalEarned << "\n";
  83.     cout << "--------------------------------------------\n";
  84.     cout << "Thank you for using the vending machine!\n";
  85.     cout << "============================================\n";
  86.  
  87.     // Release dynamically allocated memory
  88.     release(drinks);
  89.     return 0;
  90. }
  91.  
  92. // Initialize the drinks array with data
  93. void initializeDrinks(Drink*& drinks, unsigned& size) {
  94.     size = 5;
  95.     drinks = new Drink[size];
  96.  
  97.     // Drink names, prices, and quantities
  98.     string names[] = {"Cola", "Root Beer", "Lemon-Lime", "Grape Soda",
  99.                       "Cream Soda"};
  100.  
  101.     double prices[] = {0.75, 0.75, 0.75, 0.80, 0.80};
  102.     int    quantities[] = {20, 20, 20, 20, 20};
  103.  
  104.     for (unsigned i = 0; i < size; ++i) {
  105.         drinks[i].name = names[i];
  106.         drinks[i].cost = prices[i];
  107.         drinks[i].numberAvailable = quantities[i];
  108.     }
  109. }
  110.  
  111. // Display available drinks
  112. void displayDrinks(const Drink* drinks, const unsigned size) {
  113.     cout << setw(5) << left << "#" << setw(15) << left << "Drink Name"
  114.          << "Cost"  << setw(20) << right << "Available" << endl;
  115.     cout << "--------------------------------------------\n";
  116.  
  117.     for (int i = 0; i < size; i++) {
  118.         cout << setw(5)  << left  << (i + 1) << setw(15) << left
  119.              << drinks[i].name
  120.              << setw(6)  << right << fixed << setprecision(2) << drinks[i].cost
  121.              << setw(10) << right << drinks[i].numberAvailable << endl;
  122.     }
  123.     cout << "--------------------------------------------\n";
  124.     cout << "Enter the drink number to select or 0 to quit.\n";
  125. }
  126.  
  127. // Process user selection and return the earnings
  128. double processRequest(Drink* drinks, const unsigned index) {
  129.     cout << "============================================\n";
  130.     if (drinks[index].numberAvailable <= 0) {
  131.         cout << "Sorry, this drink is sold out.\n";
  132.         return 0;
  133.     }
  134.  
  135.     double moneyInserted;
  136.     cout << "Enter the amount of money (max $1.00): ";
  137.     cin >> moneyInserted;
  138.  
  139.     while (moneyInserted != 0 && (moneyInserted > 1.00 ||
  140.            moneyInserted < drinks[index].cost)) 
  141.  
  142.     {
  143.         cout << "Invalid amount. Please enter an amount between " 
  144.              << drinks[index].cost << " and 1.00 or 0 to cancel: ";
  145.         cin  >> moneyInserted;
  146.     }
  147.  
  148.     if (moneyInserted == 0) {
  149.         return 0;
  150.     }
  151.  
  152.     cout << "Your change is: $" << fixed << setprecision(3)
  153.          << (moneyInserted - drinks[index].cost) << endl;
  154.  
  155.     drinks[index].numberAvailable--;
  156.     return drinks[index].cost;
  157. }
  158.  
  159. // Release dynamically allocated memory, separate function helps with efficiency
  160. void release(Drink* &drinks) {
  161.      delete[] drinks;
  162.      drinks = nullptr;
  163. }
Success #stdin #stdout 0s 5272KB
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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.
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:
204 days ago
visibility:
public

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