Vending Machine System

Overview

This project is a multi-user Vending Machine system that allows customers to add products to a cart, view the cart, and proceed to checkout, while an owner can restock products. The system is implemented in C++ with file-based inventory management and supports concurrency for safe transactions.

Features

• Customer Mode (Buyer)

  • View available products with price and stock
  • Add products to cart with a specified quantity
  • Prevents adding more items than available stock
  • View cart with total price breakdown
  • Secure checkout with cash payment and automatic stock updates

• Owner Mode

  • View all products and their stock levels
  • Restock products dynamically
  • Update product pricing if needed

• File-based Inventory Management

  • input.txt stores product details (ID, Name, Price, Stock)
  • profit.txt maintains transaction history
  • Updates stock levels dynamically after purchases

Installation & Setup

Prerequisites

• C++ compiler (GCC or Clang)
• Git (for version control)

Steps

1. Clone the repository:

   git clone https://github.com/Paras20222/Vending_Machine
   cd Vending_Machine

2. Compile the project:

   g++ -o vending Vending.cpp -pthread

3. Run the program:

   ./vending

File Structure

Vending_Machine/
├── model.h       # Defines Product, Item, and Cart classes
├── buyer.h       # Implements Buyer functionalities
├── owner.h       # Implements Owner functionalities
├── Vending.cpp   # Main execution file
├── input.txt     # Stores product inventory
├── profit.txt    # Transaction records
├── README.md     # Project documentation

How It Works

Customer Workflow

1. Start the vending machine.
2. Select Buyer Mode.
3. View available products.
4. Choose a product and specify quantity.
5. Add to cart (checks stock availability automatically).
6. Checkout with payment (updates stock in input.txt).

Owner Workflow

1. Start the vending machine.
2. Select Owner Mode.
3. View all products and stock levels.
4. Restock or update product prices.
5. Changes reflect in input.txt.

Error Handling & Edge Cases

• Invalid product selection: Ensures input is within the available product list.
• Quantity validation: Prevents exceeding stock limits.
• File I/O safety: Uses temporary files for atomic updates.
• Concurrency Handling: Uses mutex for safe multi-threaded operations.

Future Enhancements

• GUI Interface using Qt or GTK for better user interaction.
• Database Integration instead of file storage for scalability.
• Card Payment Simulation for a more realistic experience.
• Admin Panel with analytics and sales tracking.

Contributing

Feel free to fork and contribute! Submit a pull request with detailed descriptions of changes.

License

This project is open-source under the MIT License.

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Developed by Paras Kumar Sharma 🚀